'Multiple personality disorder' is not actually considered a real condition. Evidence for it is mostly anecdotal, at best. Dissociative disorders (particularly dissociative amnesia combined with dissociative personality disorder) are closest, but still not even close to what popular culture portrays.
Help.
My sympathies.
What I would do is take a step back from your every-day and consider what this means for you, realistically. Writing it out helps - if you have realistic consequences penned out to compare against your goals and lifestyle, you have a realistic hope (which is otherwise a misnomer) of finding workarounds to live however you like. Come back to this often. Erase, edit, and delete as you please, whenever it comes to you. If you're the journaling type, that helps, but this is a list, and everyone loves lists.
You should be willing to try what your professionals suggest earnestly, but also willing to evaluate how they affect you honestly, which can be very difficult when other problems are present in your life. Listen to feedback about how you're perceiving things - schizophrenia has a very powerful effect on that, and trusting your perception (particularly of people) is dangerous.
Consider - it's really unlikely your psychiatrist/psychologist is trying to hurt you in any way, and there is a well-trodden path if you want to take it. You are not alone. You can still be successful, it will be difficult, but going it alone is going to be much, much harder. There's volumes of literature, both first-hand and otherwise, on and around all kinds of schizophrenia - I'm sure she can suggest some for you. If there's a support group around, go to it - you don't have to talk, and you can explain that you're there because you're uncertain what it means for you to have it, which is probably true.
Most of all, good luck. I don't know you well, but I think everyone deserves to have a chance to find peace with themselves.