Extensive periods

Josie
So, I'm on day 88 (give or take a day) of my period. It's been off and on spotting to now full on  non stop bright red, you get it... Super fun. I have an emergency-establish gyn appt tomorrow, I've taken progesterone, I do NOT have anything wrong with my ovaries (and never have and multiple US to prove it) it's all due to a super cool thyroid malfunction... 
So, now that that's over with, anyone else with thyroid issues on birth control to control this monster? If so, what do you like and why? I'm super curious but want input from other girls first