What you are describing could be a dissociative disorder or a psychotic thing. I had to take a whole bunch of tests to be diagnosed DID.
Regardless, those parts probably have something to tell you. Journaling was a good tool to give them each a chance to speak.
I've been told that there is no med that helps with DID, and the antipsychotic and antidepressant and anti anxiety meds that I have tried did not quiet down the parts. So maybe the fact that you are responding to the meds means you are not dissociating. Have you asked your dr or therapist?