Bipolar disorder is not when you are happy and then sad in the space of a few hours. Those are mood swings, probably caused by your depression and anxiety.
Bioplar disorder is extreme excitement and agigation and incoherent thinking for a longer period, at least 6 months, followed by a period of extreme depression for a similar time period.
It's usually accompanied by psychosis.
You don't have bipolar disorder, but I hope you get the help you need with your anxiety and depression.