How To Treat Menstrual Irregularity?

I started having periods at the age of 13..they were regular initially but after some time it became irregular and i had periods after 2 months.Even now when i take pills i get regular periods otherwise ther's a gap of 2 months.I have stopped using pills some time back as i had tuberculosis in my spine 2 yrs back..now i have gained a lot of weight its 86kgs now..my age is 26yrs n height is 5.3..i dont have thoiroid problem n i have polystic ovaries..i want to know any other way(other than pills) to have periods and to reduce weight