Prescription for Irregular periods.

I am 25 yrs old,married since2017.I'm having irregular periods. This problem has been going on for the last two years. Earlier I had consulted with a gynecologist, he gave contraceptives to regularize the period.For a year and a half I've been taking contraceptives regularly. But the last six months I have stopped taking contraceptives. Since then my irregular menstruation has started again. Sometimes it's happening twice in a month or not once a month. Frequently there is very little flow in some months(With blackish or light brown colour discharge). Now my period has started on the 10th of this month and is still going on( around 12 days).This month too the flow is very low with blackish or light brown color of discharge. Infrequently fresh blood is coming out. Overall my menstruation is never going well. And I am having a severe hairfall problem too. I haven't tried to have a baby yet. Please give me a prescription so that I can do a lab test(Blood,USG etc.). I'veThyroid 6.47µIU/ml.