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.
