Hi Lisa,
Depression and fibromyalgia can go hand in hand. I would talk to the doctor about it and see what they say. It could be the fibro itself. And as was posted above, we do usually have low vitamin D levels. I take D3. When I remember. I have been forgetting my supplements lately. Darn fibrofog.
I take adderall for fatigue and it really helps a lot. Maybe your doc would try that.
I hope that you feel better soon.
Hugs, Karen