Period, slightly irregular, heavy flow.

Hi, I am 28yr old female.5'7" tall and I weigh 84kgs. I get period every month but few days back and forth. But I have very heavy flow that it disrupts my daily activities. I fill a couple of sanitary napkins a day for the first 4 days of period. And period also lasts for 7-8days. I do have a history of hypothyroidism. I used to regularly take eltroxin 50mcg. Past few months I stopped taking the medication and even though I get a monthly period, it's a week early or late. And I have heavy flow. I got an ultrasound as suggested by doctor for PCOS and there were no visible fibroids. But yet she prescribed oral contraceptives to regulate period cycle but it was taking a toll on my mental health. In a desperate attempt to stop the emotional roller coaster, I had to stop taking them. Should I continue to take my thyroid medication or discontinue? Should I still take contraceptives? What can I do about the heavy menstrual flow? Is there a natural way to cure irregular period? Thank you.