I totally agree with you also about how it's "hard to even think about this now without getting drawn into it."
A voice in my head early on told me to immediately stop taking any/all substances (I quit all drugs, alcohol, cigarettes cold turkey due to this and have been completely sober because of it since 2008) and so I was able to avoid being hospitalized or scaring other people, but INTERNALLY, I was just as crazy as you were.
I am REALLY curious as to what this is because it seems like a very "real" realm that one can just pop into somehow--for us, probably due to drugs or what not--but "real" nevertheless.
For instance, these days I have so many positive coincidences or "synchronicities" as I/Jung/others like to call them. And these feel no "less real" or "less crazy" than the nightmare I experienced at that point.
I've only met 1 or 2 other people who were not crazy people who could relate at all to this experience of mine so if you'd ever like to chat, I'm easily findable thru teh interwebs.
To anyone else reading this who thinks it all sounds very crazy, that's exactly what I would have thought before it happened to me! Now, I wouldn't say it's any less crazy, but it's definitely less write-off-able.