To back up to the question of nutrition and depression, what has worked for my partner and me is to eat animal protein, to eat it every meal, and to make sure we are getting enough good fats in our diet (fish, nuts, olive oil, safflower oil.) I know this is going to be controversal or even offensive for some people. The nutrition guy we have seen specializes in helping people with life-threatening illnesses through diet - my partner was definitely having life-threatening depression and was not tolerating any antidepressents well. A lot of the nutritionist's practices go against current modes of thinking. His argument is that the brain requires protein and fat to function properly and that when people started to focus on low-fat diets, there was a great rise in depression in our society. Everyone is an individual in these regards, and there are a lot of good arguments against meat. I loved being vegetarian and looking all my animal friends in the eyes without guilt. I give thanks to the animal, and have even had a discussion with our butcher about his attitude toward and means of killing. It wasn't an easy choice for us.

I offer this in case it can alleviate someone's suffering. If nothing else is working, it may be an important key.