My moods were fluctuating tonnes - my pdoc put me on lithium (but he's not sure if I'm bipolar or unipolar), and my moods are finally very stable.

last month (before I took it, and was on anti-depressants alone) I used to go from quite happy and thinking life was great to thinking that life is horrible and barely being able to move.

Once I had friends of my parents over and I was really irritable. I went off on a rant about the environment and couldn't stop myself even though I knew I was going too far. Then I also was very irritable with a friend of mine and kept interpreting everything she said horribly - apologized for my behaviour...
Am I bipolar?