Thank you for sharing this.
I want to share my own experience, it will probably be tldr for most on here but I'll go ahead anyway.
Awhile back when I was serving in the Air Force, I was deployed and on my off time had nothing really better to do so I started studying a lot of self-improvement material. One book I decided to pick up was called 'The Power of Now'.. I would read it when I had a couple of minutes to spare here and there.. but most of it was consumed when I took my ~4 mile run at night time, I would pop in a pair of headphones and listen to the audiobook. Ultimately, it was too fluffy and spiritual, but if you can get past that part, a lot of the context is invaluable.
Without getting way too far into detail. The book talks about enlightenment, and the fact that the only thing that truly exists is the present moment. That the past and the future are merely illusions that can teach us valuable lessons, but more often than not hold us back from happiness and fulfillment as well as blind us from the beauty that is all around us. It emphasized that we should make conscious efforts to stay in the present moment. Definitely not a new concept, but it's one thing to understand this conceptually/intellectually, it is a whole other thing to actually experience it, know it, and feel it.
One night I was out running and listening to the portion of the book that talked about the illusion of time and that we only true exist in the now, and as I was listening I began to feel something start to surge in my body as I came to truly realize and experience what the book was talking about. And then it hit me, like a baseball bat made of euphoria, the strongest epiphany I've ever felt. I understood, I felt it, I finally realized how amazing everything around me really was and how foolish I had been my entire life for living inside of my head, in the past, and constantly worrying about the future. Not only was I overwhelmed with an unexplainable happiness, I was charged with energy..
I literally almost sprinted the remainder of 4 mile run, and didn't even get winded. I then went to the weight room on base where I knew I had some friends who were lifting. I didn't really want to explain to them what was going on, just wanted to see their faces. They had 225 lbs. on the flat bench, the most I had ever done was 215 and that's when I was lifting heavily... at this point I hadn't lifted in over a year and I had maxed out at 185lbs. right before I started the deployment and hadn't lifted at all since.... They convinced me to give it a try with a spot.... I picked the bar off the rack without a problem, it felt strangely light, I then brought it down to my chest and pushed it up with a little struggle, but no assist.... I just laid their in amazement. I could have even probably handled 10-20 more lbs.
Anyway, I went back to my room and slept a peaceful sleep. In the morning, the feeling was gone. And since that day, I've never experienced it again. But that night, I felt truly alive, life never felt more worth living.
If I could figure out away to make that feeling a 'switch' I would be all over it.