I have not seen anything of the sort, but it may have sparked something in your mind. I'm curious though, whats it like?
If you experience Black outs people you don't know talking to you like they know you/calling you different names Household objects appearing/disappearing/moving "waking up" and being somewhere you don't remember traveling to you need to get checked out. I have never seen evidence that MDMA caused multiple personality (now it is referred to as Dissociative Identity Disorder). Most multiple personality is the result of severe child abuse, so if you didn't have it before you took MDMA, you most likely don't have it now. If you are still concerned, look up Dissociative Identity Disorder info online.