How To Treat Prolonged Menstruation?

since i was 28 years old i have history of prolonged menstruation which sometimes,it takes 1 month or less for me to have my period.most of the time i will consume 10 or pcs of pads(large)per day.last 3 or 4 yrs i had D n C\procedures which accdg to my OB,my endometrium is thickened but i am free from cervical cancer..she did not giv me any medication but after 3 mos. i had prolonged mperiod again which i did go to doctor anymore till now..Sometimes im taking iron supplement but not compliant to my medication..2x i had blood transfusion because of history of low Hb and admitted also 2x because of weakness and low Hb..since 5 months i had my irregular period,if this month i had my period then next month i dont have,now my period only lasts for 7 days and not too much..what will be the best thing i will do,do i need still to go to my doctor for check up and do some tests?i'm 37 yrs old,single,5'1 in height and 54 kgs...thank you very much