Off the top of my head (And I'm far from an expert on the matter) it sounds a lot like the kind of mania I'm experiencing. I bounce off the walls, listen to really loud music and talk really fast. I start 5 things at once, and get none done. When I get home I'm exhausted from this busy day (Physically and mentally), yet I cannot just crash on the couch. When I'm depressed, I can put my head anywhere at any time of the day and within minnutes I'm out cold (I even use my lunch break to catch a 45min sleep in my car!)

I think your body is exhausted, as is your brain from the mania, but the rushing thoughts cannot let you actually go to sleep to recharge your batteries. When you do sleep, check you aren't spending too much time in REM sleep (Typical of depression) which is characterised by lots of dreaming, but doesn't allow your brain to relax, and mentally you may as well have been awake.
I know you are staying away from meds at the moment, but how about taking sleeping tabs early one evening (Like 7PM) and really getting a proper night's sleep. Otherwise you will head towards burn-out. And when you finally get to go to your pdoc appointment and can discuss this with him, he can put you a maintenance med combo. Be sure to tell him about your current necessary dosages though