I couldn't say for sure, and we don't do case consultations here, but I'll make a couple of general comments.

1) dizziness and feelings of depersonalization (or feeling not like yourself or as if one is someone else) are common in EMDR when dissociated experiences are tapped into.

2) sometimes what happens in EMDR is symbolic, not literal. So we just go by the results and don't worry too much about the contents.

3) all mental processes, in and outside of EMDR, are subject to sources of inadvertent distortion. Just part of the human condition.

4) I've heard several people say they felt they accessed past lives in EMDR, but its pretty hard to be sure that that is what is happening. Like I said, accessing dissociated phenomena or fantasy or even past movies etc could provide the same internal experience.