Depression can have an EMOTIONAL cause or a NUTRITIONAL cause (or both). Except for your moodiness, the physical symptoms are most likely nutritional. If there was an emotional cause that you never cleared up (closure), your nerves (stress) might prevent normal body functions, but most likely, the outcome would not be so severe as you have mentioned. Being sensitive to cold (and continuously) is a function of blood circulation and probably means you need minerals and other nutrients. Your body could be only physically depressed (not functioning well) and only need proper nutrition (which could also cause moodiness). Are there any emotional issues that would have caused depression?