Suggest Remedy For Constnat Mesntruation With Chocolate Cyst

i am 22 years unmrried.i have a cyst in my ovary.it is a chocolate cyst. doctor prescribed me to femilon from he second day of my periods. its been 10 days now that my periods have not stopped . i used to have periods of 3 to 4 days only . n clots are even passing. why is it happening and when my periods wil get stop?