I ve bin suffering from depression for atleast 3 years. it comes and goes. please help.

Depression: Dear koala, they key word here is "suffering". The good news is that you don't have to. It takes committment, but there are many routes to wellness. I suggest that start by seeing your regular physician. He or she can assess & determine if there are any organic causes. Your provider may refer to a psychologist or psychiatrist. Take care.