Depression can be a symptom of Celiac disease and the effects you've seen from your diet change would be consistent with that...have you been tested for Celiac?

Depression can be a symptom of Celiac disease and the effects you've seen from your diet change would be consistent with that...have you been tested for Celiac? Did/do you have any of the other symptoms associated with that condition? If you haven't been tested, you should have your doctor get you the blood test since knowing for sure may point to other things (e.g. beer) that you should stay away from and may inform other medical decisions.