I would talk with your doctor. Depression is very common and they have some really good non narcotic AD meds out there that help. Congrats on getting off the pain meds!!
I agree with kelly there are several herbal or vitamins that can help with the depression...
You can always talk to your doctor and see what they can do to help you with your depression. I also suggest and herbal supplement called Saint Johns wort! Good luck to you have faith!