This happened to me as well. I was put on an AD and then later diagnosed with hashimoto's thyroiditis, which may have been causing the depression all along. We'll see when I've finally gotten off the AD. It could be that I have both, but it is common to have depression with thyroid issues, especially with the fatigue anyway.
Yep, I can back that up! with experience!!! I was very depressed before I was diagnosed with Hypothyroidism!!! thought I was going to die... Still not 100% though!! get blood work done for thyroid, it can hurt!!