Hi kikki27. For myself prior to being diagnosed the hypomania could cause my mood to change from nice to extremely angry. I found the anger came from reacting to someone or something, but my response would be amped up by 100. There are many different symptoms that can make up a bipolar diagnosis and it's best to speak to a Psychiatrist about it.

You may want to start tracking your mood to see if there is a pattern to it. I use this online one http://www.medhelp.org/land/mood-tracker