I am trying to figure out if i am bipolar.?

i have very drastic mood swings almost daily. i get very aggravated at the smallest little thing from making a typo to a slight insignificant disagreement. and i also get very depressed and cry at the drop of a hat. i have been like this for as long as i can remember. i was diagnosed with add and then adhd when i was younger but was only medicated for six months at the most. these mood swings are having a very negative impact on my life and i cant control them or understand why they happen. my life seems to be run by my peculiar way of overreacting to every little thing. it has ruined many relationships and caused me to make many bad decisions that i regret l8r in life. I think i am bipolar... but i would like more opinions.