If a doctor thinks you are on the meds, then you need to make this decision with his/her input or you might make things worse. If you mean you decided not to go to the doctor, then maybe. I'd start a mood diary which includes what you ate each day, what kind of exercise you did each day, what medications you took (herbal, over the counter, prescription, and things like alcohol or other recreational drugs) and how you felt that day including motivational level and satisfaction level to track what is going on and what might be help. This can also help a doctor or therapist help see your whole picture.