I feel horribly nauseated since the beginning of October and emotional beyond belief. my period was due the 20th, the 19th I spotted light pink and that was all, cramps and all went away and I thought it was implantation bleeding. Well I started my period it lasted 2 days then it turned to dark brown for two days on and off. Anytime I eat I literally am on the verge of throwing up. I cry over everything and god do I mean everything!! What could this be?? Pregnancy test on the 19th said negative. Please tell me what u think