I'm new to this group and I've struggled with anxiety and depression for many years. I'm no stranger to the common anti-depressant which seemed to work for awhile, but slowly it would lose its effect. I moved to an integrative medicine doctor because I was sick of taking meds and still not feeling great. He was so refreshing because he taught me about nutrient depletion and how medications can actually cause symptoms like anxiety, depression, mood disorders, fatigue, etc.
Long story short, I found out I was severely depleted in B12 along with a few other nutrients. I'm no longer on any medications. I've changed my diet. I'm exercising now (unheard of). Most importantly, though, I feel amazing.
Make sure you consider the side effects of meds before you go on then. Sometimes the negatives way outweigh the benefits. My doc also showed me a site which you all may find helpful. It's mytavin.com and it's a free online calculator that shows you how your medications may be depleting you of vitamins and the side effects associated with the depletion.
Anyway, hope that helps!