I've had similar psychic experiences... I don't know if they are better described as dissociation or depersonalization. I felt very disconnected from external world, it didn't feel convincingly real to me and my brain didn't seem to be processing the incoming sensory information in the right way. It's as if I could make sense of it logically but not enough energy to process it through feelings.
For me, having moments of intense inner emotionality (usually with crying spells) and strong feelings about my past happened on the way to brain function improvement - so take it as a good sign.
The interesting thing at the clinic was I had been feeling severely frustrated for about 24 hours, I could not even tell you why, but they the fog finally broke and the dissociation stopped. Somehow the frustration seemed to be a tool.
I agree with you that it's a terrible state to be in, and I think I'm still scarred by the whole experience but it also gave me a new perspective on myself and life in general. In the end, I've chosen to view it as a spiritual experience.
I am sorry that you have this experience, too. It affects us so profoundly and in ways we can never really communicate. Lots of love to you, @Iritu1021.