Suggest Treatment For Irregular Periods While Having Pcod And Thyroid

i attended my puberty at 2003...i had regular periods for 3 to 4yrs.....then later was irregular...have consulted doctor and they said i hava polycystic ovary...took tablets for about 6 months..they said i have thyroid problem took tablets for tat too for 6 months....but not cured completely and not getting periods regularly....im fed up of taking medicines for 4yrs....can yo say wats my problem and cure...wat i have to do and which doctor can i consult...my age is 19 im in chennai