Didn't think this would ever happen in my 20s, but here we go

My dad suffered a severe heart attack and sadly passed. I can't believe this happened and wish it was all a nightmare. His heart stopped within seconds and I gave him CPR for 10 minutes with no luck. The parademics came and also tried for around 40 minutes but his heart did not restart

I've never felt this level of sadness in my entire life, and it just hurts so much

The image of him lying on the floor is stuck in my head and I blame myself for not being able to resuscitate him

Sorry to hear about your loss 😞
Reminds me how lucky I am to still have both of my parents. I can’t even imagine how devastated I will be when they pass on.
There is absolutely no reason to blame yourself, you did what you could! Unfortunately stuff like this happens.

That is so horrible! I feel so sorry.

Please do not blame yourself. This is NOT your fault!

The next days will be terribly hard for you, I'm so sorry. Suddenly everything collapsed,  like a house of cards.

We will be here for you, even if we never met, we never spoke to each other, we will never see each other in real life. It doesn't matter. Please let me tell you that you are not alone.

I'm sorry for your loss

It doesn't get better with time, but you learn to live with it.

I'm sure he was very proud of you, and you will always have him as a part of you forever. Take what you learned from him and teach that to others you love. People will be looking more towards you now and you have the strength to carry that.

I'm sorry about your father. :(

As other have said, and this is worth repeating: This really is not your fault. Not only that, you even did cpr - that is everything you could do. (For whatever it is worth: I worked at the Red Cross for 9 months and did cpr to dying people. Non survived. Different doctors in different situations consoled me, saying that most of these situations turn out disappointing. You can do everything right and fast and things still turn out bad.)

My advice to horrible images being stuck in your head: let it play out. Cry about it. Allow yourself to be devastated. But also, when to time feels right and you are in the mood, try to let other memories of your father play out. Good ones. You can talk over them and have pretend conversations with him. That is at least what helped me in tough situations.

You've done all you could but I'm so sorry. I can't begin to imagine how hard this must be. I pray that the good memories with your father will delete this dreadful experience. Please know that your father didn't suffer and found the peace so many of us dream of.

My condolences. I cannot imagine how rough this must be. My heart goes out to you.

I'm sorry for your loss. My take on a lot of things is that as long as you do the best you realistically ask from yourself in a situation, you shouldn't blame yourself. Sometimes this is not as much as you'd like it to have been, and maybe you even missed the mark by a lot, but you do what you can and no more, and it will have to do.

My dad also passed away when I was in my 20s, and it was probably every bit as surprising as in your case, although I wasn't there to witness it. His behaviour wasn't always all that healthy, but it was still a huge surprise. Many would say it doesn't get easier and you instead learn to live with it, and for a long time it felt like that, but I guess it has also got easier somewhere along the years for me at least. Some part of it is still having learned to live with it, but I guess it's also kind of easier - but what's the difference between the two anyway after some time?

Finally, a quote I quite like: 'Our greatest glory is not in never failing, but in rising up every time we fail.'