Over medicated or depressed?

I'm on a lot of "heavy hitters" due to treatment resistant mania/psychosis, but right now I'm struggling with something else. I sleep 12-14 hours a day and feel tired all the time. I'm lethargic, apathetic, and absent minded. It's hard to concentrate, and I can't read anything if my life depended on it. I feel emotionally numbed, not good or bad (well, kinda bad because I don't like feeling this way).
I see a new pdoc next week. Right now I'm on Zyprexa, Depakote, Invega, Wellbutrin, and Propanolol. It seems like a lot, so I'm leaning towards over medicated, but the last pdoc I saw said it was depression (he was at an IOP so I don't see him anymore).

So in general, how do you tell the difference?

I'm not familiar with those meds since I've not been on them myself. But if they work like Seroquel and Abilify, then my own opinion was that I was definitely overmedicated because once I got off it and got on different meds, I didn't feel so tired or groggy-like, everyday. I wasn't depressed either, that's why I compare it to that. Seroquel had me sleeping so much, my days passed me by and it seemed all I ever did was lay in bed, eat, and go back to bed. I barely functioned at one point in time being on that med and a few others. I know you say you have 'treatment resistant mania/psychosis' and so that must be hard for doctors to be able to find strong meds to help with that.

The only way I could tell the difference was when they took me off the meds and put me on others that did the same thing, but didn't have so many of those side effects. I switched from Abilify to Vraylar and added Wellbutrin to help my mood stabilize from the depression I would experience, without the added weight gain. It took a very long time to find what worked best for me. I was so overweight and I just couldn't help it. I was either just gaining weight or I would feel so much hunger from the side effects. *sigh* It was very hard.