Cause And Cure For Heavy And Long Period

hi! i'm 22 years old and i was on the depo shot for about a year a believe then i realized it wasn't for me,so i stopped taking it. Now it's being over year that since i stopped and i'm not on any type of birth control,but i'm having some serious problem. i been having my period now for one year straight non-stop,i mean everyday it probably gave me a break for a week maximum but nothing heavy,just some light old blood,sometimes excuse me for saying this but thick chunks of old blood will come out,if not that something lighter like motor oil,rusty color. i don't know what to do,it's affecting my sexual life and i already ben to a Doctor but she say i might be not ovulating anymore. It's not an answer,i'm still bleeding everyday. Thanks,i would appreciate if you could answer me that is if you ever heard such a thing.