Hi Greycat,
Welcome to the Nexus. I feel that this forum is not like others, just as DMT is not like other entheogens. Take a look around. It is RICH and saturated with delightful information on all kinds of topics related to DMT. The Wiki link that xtechre gave you is pure gold
You will find that this place is incredibly diverse with members from all over the world of all ages, beliefs and life experiences. We all seem to share a fascination with the N, N, Dimethyltryptamine molecule for one reason or another and that brings us to this "nexus" where we can meet, greet, be social, post thoughts, ideas, rants, etc. There is more of a sacred/mystical edge here than at other "drug" websites, just as there is much more of a scientific orientation. Again, an incredibly unique and rich resource.
And like most things or people that fit my above description, I honestly feel that the more a person puts into it the more they might get out of it. Your description of your first experience into hyperspace sounded incredibly intense and I'm glad you shared it. I am wondering if you might be willing to share anything else about yourself other than your age? Or perhaps more about the experience and how it made you feel. This will help to generate responses.
You mentioned catching yourself not breathing. Did you realize that it was hallucination? Or are you thinking you stopped breathing? I believe that DMT can shatter our perceptions like few other things and it's a shock when we first realize this. Which brings me to the topic of a sitter. I wonder if you used one and how that went?
Regardless of what you choose to share, I again want to give you a very warm welcome to the Nexus and do hope you'll take a moment to check it out. It is special.