Lily,
I have cylothymia which is not as bad as Bipolar but still in the same category. I have moments when I am shy and moments when I am loud and dont care what others think. I have moments when i get things done and at the same time cant even focus on what i need to do. I have days when i got out with friends and feel happy and spend lots of money with out thinking of consequences.... but also have down periods when i hide and dont talk to anyone for a week at a time. Days where i dress like a business woman but other days where i wear the kind of clothes that i regret days later....If you feel like you have 2 or more different personalities... maybe it might just me a mood disorder. I go to a psychiatrist and maybe it is a good idea for you... they can diagnose you properly. Good luck.