Firstly: congratulations on mentally assimilating that and even returning to the psychedelic world in general and in particular D itself. I think that in order to cope with something like that you need a clear idea of what your reasons for journeying are and be prepared to take the rough with the smooth to gain, or at least glimpse, the true nature of things.

Secondly: I've had a similar experience but 'one level down' if you see what I mean. I had a meta-hallucination. Sounds weird I know but it's the only way I can describe it. I hallucinated what I was fully aware of was a future experience: my judgement before Christ. Now, I'm not a Christian or indeed a religious man in any traditional sense and never have been (my thoughts on that are a whole other thread). But in this context I was watching myself on judgement day, and I was about to be damned. I felt a dizzying amount of terror, but what I mean by one level down was, that it was kind of like the emotion you get from a film when you identify with a character. I mean, it's not as if you are actually in vietnam etc but you respond physically and mentally to it. Massive massive terror but still human level terror. The vision faded before damnation.

Back at baseline I was swamped by a relief and indeed euphoria that by changing my ways I could avoid that situation. Damn near made me a Christian, and I'm going to make another thread, or bump a religion thread to explain why not.