I'd tell your pdoc and when you tell him I'd frame it kind of the way you have here.

Since taking the two meds together you've had intense paranoia and possible hallucinations. You're worried that the combination of meds (or one of the medications) is causing this and can you go off of them to see if the paranoia and hallucinations get better.

I wouldn't mention inpatient to him directly but if he brings it up say you want to stay out of inpatient and could you try going off the medication first.