Why Are My Menses Not Ending?

me 37 aged purnima i have 9 years old daughter iam suffering from hypothyroid since last 4 years i am suffering from late period in that years my periods was late for 3 or 4 month my weight is 81 kg before few months i had suffer from overian cyst i had take homopathic medicine for that now this month my period started in 5 march till today it is continue my himoglobin level is 8.5 please advice me soon what to do please advice me now