derealization

I struggle with derealization. I don't feel awake half of the time it feels like I'm in a dream. I told my therapist about it and they said it's just part of having d.i.d. I lose time. It can be 1:00 pm and the next time I look out the window it's dark out. I miss appointments time with friends. It's not happening all the time but enough to make me frustrated. Does anyone else deal with this?