hi sarayu.............i have had this happen and its very disconcerting. I've only had it happen at night with a man i was dating for years. We worked it out by him explaining quietly in a calm voice his name and what year it was and that it was okay. I would touch his face and together with his voice I felt a million times better and it happened less often after time. It felt kind of like flashback and switching happening at the same time. be well........................kasva