Theresa,
That is me to a T. I used to get exactly that way. I thought it was normal. I never had any extreme symptoms, but I had all the mild ones.
My husband called it the Black or White symptoms - All or nothing type activities.
I was an engineer and when I was up - I couldn't be beat, I'd pull all the extremely creative solutions and WoW everyone. When I was down, I could barely get emails answered. I was "sick" alot. After one of my up seasons (which varied in duration) I would just shut down. I didn't want to talk to anyone, go anywhere, do ANYthing except sleep and be in my bed.
Somewhere in the middle of my ups and my downs, I was a real grump- yelling, unhappy for no reason, just really irritated and angry inside.
Example during up times: I would throw myself into ANY activitie that excited me at the time - ignore every responsiblity and person other than my "mission".
During this entire time I was being treated for depression, but not diagnosed as BP. Now that I have been placed on a mood stabilizer - I see the difference coming around the corner.
I really hope this helps...sounds just like what I experienced.
BTW, I would also overcommit during my up times. I'd volunteer for everything at Church only to feel guilty when I came down -- letting everyone down. I can look back years and see where I've done these similar things.

Tea