I experience bouts of DP/DR which is usually brought on from stress, anxiety, and over stimulation of the senses. I'm just thankful that it doesn't last days like you described, just hours that I can ground out of. Even right now I'm floating away.
I couldn't tell you about your role playing (?) as you called it. It takes testing for those that don't know. Reality testing would help you feel that it's real or not.
Do you know any grounding techniques? I try focusing on a single object and describe it to myself, holding on to it. In a shop I'll read the label and get a feel for it. I try to recenter and focus of what's in front of me then all the stuff going on all around me, that usually helps.
Keep posting and maybe we can offer more thoughts as you reveal more.