I am taking birth control and havent missed a period nor has one been late...i have had sex several times since my period stoppe. Recently i switched from one brand to another, but the same kind of pill. I had my period last week and since then ive had cramping, bloating, lower back pain, severe mood swings, and have had really bad nausea... accompanied with a headache that comes and goes all day...plus i havent been sleeping...more like short bursts of sleep..then waking up early and not being able to go back to sleep....then theres the fact that ive had to pee like five times more often than i usually do...WHATS WRONG WITH ME?...i know im not pregnant, but woud else could it be?...i think it could be stress or depression but who knows..