Mood Swings OMG!!!

I have been having the worst mood swings since I turned 22. I am 23 now, and I originally thought that it was my birth control causing it, but I have been off it for a year and I still feel insanely depressed about 2-4 days a week. On top of that, my anxiety makes me barely speak to anyone all day at my new job. I just sit at my desk and dwell on all of my inadequacies until I'm exhausted. Other times I can shake things off, talk to people and feel generally happy. I feel like two different people. I think I may need antidepressants or anxiety medicine, but I worry about taking them. Any suggestions?