How does it feel like to be put under anesthesia?

MODS DON'T REMOVE THIS PLEASE, ITS JUST CURIOSITY

I'm almost 32 and in my whole life I've never been put under. I used to have fear of the "eternal oblivion" after death, the thought of eternal not existing used to scare the hell out of me, it was something my mind failed to comprehend. I even had nightmares about it. Now I still fear it a bit, but I think about it much less, and learned to accept it.

Some people say that being put under anesthesia is the equivalent of a "short" eternal oblivion, as you are no longer conscious. Basically you lose consciousness and the second after you are awake again, 3 hours of surgery for example are 1 second from your prospective, as there's no tracking of time without a consciousness. People that have been under anesthesia, would you confirm that it feels the same way it used to feel before you were born? Which means nothing, the moment before the surgery, and then the moment after, no in between.