Has anyone ever diagnosed you with bipolar?
and by "awful" what do you mean? i'm thinking it may be something i experience too, but not sure if your "awful" the same as my awful.
And if you take a nap after feeling that way, does the feeling disappear once you wake up again? if its what i'm thinking it is, it's a side effect of having too much sleep deprivation.

But what you describe sounds logical enough to me, as most of the things are mentioned within sleep deprivation articles. Have you tried to see a neurologist about it?
There's also something else that i think of when you mention about your sleep wake cycles.. it usually happens with people who work nights, but can happen with daytime workers as well.
Here's a link on this(however where it states it's insomnia if you dont work night schedules, that is misinformation. as night shift isn't the only thing that can mess with someones sleep schedule on a persistant basis. Insomnia is just the "cant get to sleep" phase, while the other types of sleep problems are more indepth)..
Shift Work Sleep Disorder-Topic Overview

My neurologist was the one who figured out what my sleep issues were (Hypersomnia (Reason: fell asleep to quickly each time in the morning test), sleep disorder nos (reason: I never ever go into the REM cycle sleep stage)), and due to the daytime and nighttime issues caused, he put me on both a sleeping med, and a wake up med (which was seroquil and vyvanse for me).
Most likely the first thing the neuro will want to do is a sleep study, and prolly a EEG (monitors to see if you have any abnormal brain signals that could cause sezures or epilepsy), and i can't remember the name of the test in the morning that they did, but it was 4 letters and the first one started with a M. and that one tests to see how fast(or slow) you fall asleep each time they wake you up. if its quicker than the normal range, then thats hypersomnia.. if it's slower than the normal range then it's called insomnia.