I think Multipixie is right about the derealization/depersonalization, and those are labels to help people talk about their experience. Many people have experienced similar things and I realize it must feel very scary, but you are not going to fall apart. this is a time to talk to someone, try some grounding techniques, breath slowly, rhythmically. Perhaps you have things in place that comfort you. Can you think of something that would help you feel safe. Someone posted a whole list of grounding sugestions recently, either here or in ritual abuse. Did you see it? There might be something there for you. My heart is going out to you. Be safe as best you can.