I am really scared, why do I keep bleeding? Is it my period? 

I bled from October 13th through 17th with no brown discharge, I started getting brown discharge on October 30st, and it turned into heavy bleeding that lasted until November 6th. I started bleeding again on Friday, and it started with just brown discharge, but then it turned into heavy bleeding again. (I only started getting the brown discharge once I started having sex again). 

Just in case this might have an impact on any of the answers I receive. I had the depo-provera shot in May, and in August I started the pill, but I stopped two months ago. I am sexually active.

I am also having trouble eating, the smells make me kind of nauseous, and I consistently have bad abdominal cramps even when I am not bleeding.