I've always been super skinny due to my lack of thyroid (born without one), however I've lost tons of weight within the past couple of months. I'm 5 foot 6 and was 128 about a year ago and stayed that way until a few months ago. I'm now 108 pounds and haven't gotten my legitimate period in at least 2 months. It's just been this nasty brown discharge (sorry, only way to describe it) and I'm starting to get worried. I'm on birth control but it's never affected (effected?) me in a negative way. 

I don't know, sorry this was so long. Should I see a doctor? I feel like the period and eating issue are connected somehow.