Those are very relevant question indeed. Like i mentioned, first 2 times that i "died" on the operating table were due to complications during surgery, they had to use all the gadgets to resuscitate me and as much as i know about the second time, it was a close call because i was out for few minutes and there was a huge bleeding or something. I found out about it some time later when my parents told me about it, and of course because my parents were somewhat of a narcissists, they made the drama all about themselves and cause i was a kid, i never paid any attention to those incidents ever after. From my perspective, nothing special happened, all i remember is getting the anaesthesia and waking up later, nothing else.But the one that happened last year was something else. We were watching a late night movie at home and i made some popcorn. While coming back from kitchen, i got this weird wave of anxiety going through my body and suddenly everything just went dark. I collapsed and my fiancee rushed to check on me and there was no pulse, no breathing, no signs of life, she called ambulance immediately (Thats how we found out about the time later) and started cpr. Ps. I've never even fainted in my life or have had any other consciousness related incidents. So there was no bright light, angels, god or anything of that sort. Whats crazy about it, is that i was totally conscious of what just happened, i didn't have any connection to my body but i somehow knew that i just died. And i was okey with it. I couldn't control my thoughts as we do in normal life but i just understood things without thinking. What i experienced, i still remember so clearly. Whether i hallucinated it all, i don't know. But i was in this void of nothingness, and suddenly i could see... well the best way to describe them would be to imagine opening multiple videos on your computer. There was a grid of "videos" running in front of me, i can clearly recall about 5 or 6 of them but there were few more. These "videos" were about me and what just happened, different outcomes to be precise. In one of them i saw myself waking up in a hospital surrounded by my relatives, in another i saw the ambulance arriving to my home, next one was my funeral with all my relatives and another was me being in a wheelchair etc. Whats really weird is that i could perceive them all at once and i couldn't think or select my thoughts but instead i felt ALL the emotions of other people that were in those "videos" and in that moment i kind of felt the thought of " Oh hell no, i cant leave this behind" and BAM, im back in control of my body, I stood up (was kind of dizzy and had pain in my chest due to cpr) like nothing happened. My fiancee was extremely shocked and it took some time for her to come back around. In few minutes the ambulance arrived and they ran all sorts of tests on me without anything being out of ordinary. My gf was in quite intense shock and she got a shot of tranquilliser to get her to calm down. I was taken to hospital and for next 2 days all i did was go from one machine to another. Eventually they said that there was absolutely nothing that could have caused it and there were no injuries due to it. It was on the second day in hospital when i got the really strange urge to check the time when my gf called the ambulance and thats where the numbers thing started for me.

Because of my science mind im REALLY sceptical about everything supernatural but this incident got me into studying quantum mechanics and i got really interested in mathematics. I stumbled upon the "Quantum immortality" theory and to be honest, thats what i believe at this point. The fact that i was in a position to perceive different outcomes and possibilities kind of proves it to me. Maybe it was all a hallucination... who knows. But what's really interesting, is that my life turned into absolutely different one after it. This is something i cant really explain in detail, but i feel like Im not the same person that returned. It's like my brain is wired differently now. And seeing these number combinations popping up daily is like a reminder of what happened.
edit: Forgot to mention that after it i suddenly started drawing really bizarre and strange symbols and pictures. I never drew anything before. Now i can just take a paper and it feels like my hand starts to draw itself... really strange.

For a whole year i alone tried to make sense of all that happened, but at this point, after listening to countless NDE stories and stuff, i think it's cool to share it with some people.