It could be. I spend like mad and am insanely active when I'm manic or hypomanic. Why just this week I bought an SUV! I was dx with depression at first and my doc didn't believe me until I got a new dr who took an in-depth look at my symptoms and said I was bpII. Then after an insane mixed episode I ended up in the hospital for over a month, he dx me with BPI.
It's entirely possible. Talk to your dr about your symptoms, and look up some mania rating scales, like Youngs Mania Ratings Scale. Read up on the symtpoms and go prepared. If your doc doesn't take you seriously, maybe it's time to move on.
How long do these episodes last? For bipolar you have to have had them for at least 3-5 consecutive days, and any amount of time if it requires hospitilzation.
Hope this helps. I can completely relate.