HELP ME

Hey guys! I'm 15, and very active in school. I'm extremely nauseous every day, feel as if I'm gonna throw up, very pale, shaky, and just confused.  All of the symptoms seem to happen every day, and is beginning to worry me. I know for a fact I am not pregnant, nor sexually active. If I knew what was wondering I am a swimmer, cheerleader, and soccer player. I suffer from major depressive disorder, anxiety, and bipolar disorder. If anyone has any ideas why this keeps happening to me, please let me know!! Thanks guys.