symptoms, im worried

For a week or so now, ive been hungry a lot more often, like I will have my dinner and 10 minutes later ill be hungry again, it feels as if ive not eaten. Also, I wont stop poooing, usually id go oncea day, or even once every two days, but now im pooping four, maybe five times. Ive got a lot of lower abdominal pain, I stood up from bed and it really hurt so I had to stsy still until it passed. I dont know if it has anything to do with this but before all of this I had a lot of discharge and it was kinda brown.. I female and im 16 if it helps