I too think that in order to be diagnosed (dx) bipolar, you need to experience depressive episodes. Another major part of Bipolar is mania - out of control, or totally out of character, happiness and energy. In full mania you really aren't yourself, probably drink much more than usual, engage in unappropriate sexual activities, can go for much longer on much less sleep, have racing thoughts...

I can relate to the anger which is inapproriate - i think you just need to ask my boyfriend and he'll more than agree I can get so angry I just scream. It gives me a way to let off some steam and buys me a few seconds to consider my reply. I actually sometimes have my whole body tremble with rage and I just feel so helpless, I don't know what to do.

While I can relate, I don't think having this one issue will automatically point towards bipolar. I do suggest you go and see a psychologist to diagnose you first. A psychiatrist is the one that would then prescribe any medication if necessary. It may also be extreme anxiety causing you to respond this way, kind of like protecting you from what you perceive to be an attack.