I know this is an old thread, but I'm gonna go ahead and share my story on here because this is the only thing I've found on the internet that relates to it:
One time I was tripping with a couple of my best buds. I only took 1 hit, but my buddies were on two. My friend, A, and I were completely in synch for the come up. He would kind of answer questions or complete thoughts in my head as I thought them, and vice-versa. All of a sudden, A looks at us and says, "Whoa guys, we need to talk about what just happened." I had no clue what he was talking about, apparently I had missed the boat, but my other tripping bud said something had just happened to him too. A's little bro was in the room, sober, and he all of a sudden started crying. He said he felt like he was tripping on acid. A talked him down a bit, and eventually his little bro went off to sleep. After this, A was not the same person. He started spouting out all kinds of stuff that I can't even begin to explain. He was speaking and moving more fluently and intelligently than I have ever seen anyone do in my entire life. Shortly after he began, my other friend started to stare off in the corner of the room and was no longer participating in the conversation. After this, he started spouting a lot of really weird stuff. He said he could be the antichrist himself, and kept using really suggestive language that he was no longer himself, without saying it. He was saying a lot of blasphemous stuff. A continued to speak fluidly, without a single pause or stutter for over 5 hours, and the entire conversation was directed right at me. At one point, he grabbed me and said, "This is the part you're going to look back on and ask yourself, 'was I just tripping? was that just a dream? did that even happen? is he really bending every single particle of my existence with each word he speaks?'" As he spoke those last words, my hearing, feeling, and sight all bent and distorted with each word he spoke. This scared the holy shit out of me. I felt absolute terror. I wasn't even hallucinating until that point. After this, he sat back and kept suggesting that I should join him, and that I would be communicating with him on an entirely different level when I did. He even said that there was a music festival going on in another state, named the bands that were playing, and said that he could have VIP tickets with the snap of a finger. He said he wouldn't hurt me because we were friends. It reminded me of the Grateful Dead's "A Friend of the Devil." Needless to say, I didn't join him, but this experience is something I have completely failed to integrate. I kind of just buried it in the back of my mind and forgot about it until now. I really really think this is a little beyond just tripping. I've tripped at least a hundred times, and nothing compares to this. To put the icing on the cake, towards the end of his rant, he said, "What if I said that this is a HELL of a trip, would that be accurate for you?" with a sinister grin on his face. Does anyone have any explanation for this?
P.S. A's little bro had to go to the hospital for about a week after this and was out of it and depressed for a few months. Sometimes he would become unresponsive and go into a catatonic state. He was always a really happy kid up until this point. Eventually he pulled out of it though. Seems kind of parallel to the OP's story, in this case A's little bro would be the 'girlfriend' or 'victim'