Thyroid related very much iperiod issues

I am a student and unmarried. I have issues of thyroid since 2018 and I am taking thyroid medicine everyday i.e. thyrox 50 mcg. My period is irregular since 2 years. It has not come since last 4-5 months and this usually happens. I have consulted with a gyno, she had examined me  and told me that I am not suffering from pcod but my endometrium wall got thickened and had given me hormonal medicine to bring back my period. It was normal for 1 month after taking that pill but got irregular again. I haven't got period from last 5-6 month. 2 month back I got some very sticky brownish thing coming out from vagina that ultimately result into thick bleeding which lasts for 10-15 days in month of March . After then I didn't get any period or cramps. Only that sticky things came for 4-5 days but period didn't. I am not suffering from any pain. I had consulted a gyno online she told me to consult with endocrinologist. I have gain a lot of weight and feel tired all the day long. have put a lot o