((Scaredgirl)) How is your relationship with your mom? I would try to tell her about it. Tell her that you're not feeling well, whatever you might be going through right now. If you don't think you can talk to your mom and you are still in school, try to talk to a school counselor. Most of all, try not to be afraid of this. First, it might not be bipolar...but even if it is, it is very treatable and you can get better.
The important thing for now is to talk to someone who can do something to help you.