how do you know if your bipolar
The first signs of bipolar disorder is extreme or severe mood swings. You try out some bipolar tests, like one found here: http://support4hope.com/bipolar_disorder/bipolar_test.htm#1. Still, the best way to find out is to visit a doctor.
If you think you have bipolar you should contact your doctor. A major symptom of bipolar is mood swings.