The only way to know whether you are Bipolar is to see a qualified mental health professional. No one can offer you a diagnosis via the Internet.
Med Help International
Well, there's only one way to find out--and that's to go visit a doctor. You are definitely stressed, possibly depressed, that much is clear. But there are many things besides stress and depression that go into a diagnosis of bipolar disorder. There is no need to assume that you are bipolar.
Go see a doctor, and I hope things get better.