Not a medical doctor here, but... four medications isn't an insane amount. Depression is a character trait in my family and being on 3-5 different medications isn't out of the ordinary. The question is, is this an experimental treatment (checking what works) or a treatment that is meant to be sustained. Many doctors give antipsychotics just in case or to help with sleep. I myself take antipsychotics for that exact reason. I literally can't sleep without them.

As far as I know, it's completely normal to do a med-combo, not sure how common yours in particular is, but balancing meds is a thing that I've encountered (with a few different doctors).

What I'd personally be worried about in your situation is your liver and stomach (not paranoid, just some healthy concern). Taking a lot of meds can impact that. But like I said, I'm not a doctor, just a semi-professional patient and a medical practitioner (my field has to do with muscles and joints, not the brain, so I guess I could've left that part out. Guess I wanted to justify my diploma). Cheers. Hope my rambling helped in some way.