https://myanimelist.net/anime/33489/Little_Witch_Academia_TV

I think you could benefit from continuing to work out. You will be sore at the beginning because you don't work out often and your body isn't used to it. Make sure you're working out with good form too of course as that's a rookie mistake many fall to and then quit.

Working out isn't necessarily de-stressing, but it allows you to feel good about yourself afterwards in dividends while getting your body and mind to a more resilient level.

I think you should work on being more resilient in other words to stress.

Stress is unavoidable, but how you handle it is what matters.

Fuck bitches, get money.

On a serious note, video games and inebriation. But we've both got that covered, and I dunno how to help if that's not working for you because it works for me.

This.

I also find that eating healthy and drinking water can keep bad thoughts at bay. Think of your brain/body as a giant burner ~ the grade of fuel you put into it will dictate how well or how clean it runs. Binging on junk food and soda, at least in my experience tends to match up with days that I feel alone or have more suppressing thoughts flowing through my mind. But then, on days that I cut out fake sugars and eat vegetables and organic protein, I find my mood is drastically changed, I have more energy and feel much more outgoing. These simple changes alone will go a long way. Working out can also help motivate you to eat right as well though, it's a vicious cycle. Reading books is also a healthy habit. Technology in the long run is centered around instant gratification that involves minimal effort to achieve. Ultimately this seems unhealthy and leads to people being self entitled. Maybe try finding spots to go hiking and getting fresh air. Being around nature and life is a fantastic thing. 

Might want to tell that to Michael Phelps or all the NFL players who get weed suspensions.

Contrary to what propoganda ads would have you believe, smoking weed and leading a productive life are not mutually exclusive.

^ Some very good advice here covering many bases 

haha. He's my favorite character from that show.

There's intense stress and mild stress, rational and irrational stress. When it comes to mild, rational stress or depression I just do the things I love. Video games, hockey, a walk, a drive, exploration, hanging out with friends, a few beer, exercise, my wife's titties. These and many other things take away problems.

I used to work an extremely stressful job as the chief of staff of a municipality. It was basically game of thrones with less death but more betrayal. I was the hand of the king, and the nobles (Council) were out to back stab each other, and me. My Director of Finance goofed up on something major. It wasn't theft or anything, just some incompetence. It didn't affect the corporate finances, but did affect the reporting of said finances and made the Council look a little bit bad. The subsequent two years were a brutal stretch of scheming and deflection of blame which caused me tremendous stress. During that stretch I played a lot of Age of Empires online. I liked it because it was generally slow paced, but still competitive and all-consuming while I played. I could forget the world. The same with playing a game of hockey. When I'm depressed a generally avoid games with tension or "stealth" elements.

But to the OP's statement, It seems you are dealing with a bit of irrational stress. Others on here have offered tips like treating yourself, doing fun things, etc. You seem like you already do, and you have a GF. But you also state that you barely sleep and you have some medical challenges. If you want to make things better, you're going to have to deal with some habits in your life. You gave an example of having a rule that you don't play another game until you beat the first, but yet you aren't enjoying Witcher III. This is an example of you self-imposing an irrational rule on your own life, and a rule that isn't bringing you any happiness. I suspect you probably have other self-imposed constraints that are causing you worry or reducing your joy in life. I fully understand this type of behavior. I used to go to a favorite website that was fluff entertainment. At some point I started saving photos and memes I liked on the site in a collection, a collection I never looked at again. I missed going to the website for a few weeks, and when I returned I was obsessed with going to the earlier entries and saving anything i thought was awesome. Then i went on a trip and missed another week. Further behind. Eventually I was months behind and couldn't go to the website anymore and I needed to check out the backlog, didn't have time. I then avoided my favorite website for a year. When I finally went back, I started fresh and ignored what I missed. But I enjoyed it again. And the entirety of my behavior was stupid, irrational, and stopped me from enjoying something I liked for an entire year. It was a behavior I needed to correct.

It sounds like you are giving yourself more stress than actually exists in your life. You seem to have a lot of positive things going on, despite some challenges like seizures. (my wife dealt with those BTW, I'm very familiar with the challenge they present) So rather than looking for distractions from what's bothering you, I suggest confronting the sources. Start with something simple: ditch Witcher III and play something different. You must do this. It's a game that is not bringing you fun, so play a game for fun. Then examine other irrational obsessions that bring you down, and battle them. The strength must come from you, and you can do it if you truly want to.

Same (except for the meds part). I think lying in bed is the only comforting part of the day. 

 When I was playing Parasite Eve II, I just wanted to get through that game because I wanted to play Silent Hill or any other, and was getting frustrated about not being able finish the game soonl that game really was a chore for me. A suggestion I can think of is to go through the short games first, so you might feel like you are getting to play more games.