Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. Under active thyroid cases do show depression symptoms and the correct treatment is to be given to thyroid. But it also depends on how under active is the thyroid in your case. I think your doctor did not give you any medicine for depression or under active thyroid because the problem was just correctable with natural means. For now do not worry about your depression and start having good diet suitable to thyroid glands. High-Fiber Foods, food containing selenium (whole-wheat bread, bran, Brazil nuts, tuna, onions, tomatoes and broccoli), Antioxidant-Rich Foods, Iron-Rich Foods etc can help you boost up the function of thyroid. Please post a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe some psychotherapy techniques which should help you cure your condition. Hope this answers your query. Available for further clarifications. Good luck.