When I was young, I could had about 12 years old, I usually did relaxing sessionsoften relaxed while listening to a recording. When I was young, about 12 years old, I often relaxed while listening to a recording.

Perhaps by relaxing sessions you mean meditating? In which case "I often meditated while listening to a recording".

When I was young, I could hadve been about 12 years old, I usually did relaxing sessions listening to a recording. When I was young, I could have been about 12 years old, I usually did relaxing sessions listening to a recording.

I remember how I wasould relaxing several body parts, begining in my feet and ending on themy head. I remember how I would relax several body parts, begining in my feet and ending on my head.

I remember how I was relaxing several body parts, beginning in my feet and ending on themy head. I remember how I was relaxing several body parts, beginning in my feet and ending on my head.

AlI ways I had a good level ofalways very relaxed. I was always very relaxed.

Always I had a good level of relaxation. Always I had a good level of relaxation.

you could also say "I was always well relaxed"

But once, occured someething unexpected occurred. But once, something unexpected occurred.

But once, occured someething unexpected happened. But once, something unexpected happened.

your word order is unnatural here

I was enjoying of the relaxing when suddenly I noticed how asthat I had caome out ofrom my body. I was enjoying relaxing when suddenly I noticed that I had come out of my body.

I was enjoying of the relaxing when suddenly I noted how as came out ofrom my body. I was enjoying relaxing when suddenly I came out of my body.

Some seconds later, I noted howthat I was levittating to close to the ceiling. Some seconds later, I noted that I was levitating close to the ceiling.

Some seconds later, I noted how I was levittating to close to the ceiling. Some seconds later, I was levitating to close to the ceiling.

All this was very speedudden and strange. All this was very sudden and strange.

All this was very speedfast and strange. All this was very fast and strange.

very speed is not a phrase used, high speed is fast and low speed is slow. You could say "at very high speed" also

In that moment, I only wanted aone thing, this was to go back to my body, and a second later, I had went back. In that moment, I only wanted one thing, this was to go back to my body, and a second later, I had went back.

In that moment, I only wanted aone thing, this was to go back to my body, and a second later, I had wentwas back. In that moment, I only wanted one thing, to go back to my body, and a second later, I was back.

All seemed ok, and like this way, this experience ended here. All seemed ok, and like this, this experience ended.