Groove symptoms and conditions

i am basically here for some help...i have been on the nuvaring since the 19th of june.things went fine for about two days.then i started bleeding heavy and having awful cramps.it has been like this EVERYDAY now.i am supposed to take is out on the july 3rd.did it do this to anyone else? or does anyone know why it is doing this? my menstrual bleeding has never been this heavy or have i ever had cramping this bad! and it most certainly hasn't lasted for almost three weeks! also i don't know if it has anything to do with the nuvaring or not but my knee's have been killing me! i have never had this problem before and i am a fairly active person and always have been.i also recently had a child.she is two months old now.i weighed 160 the day i went in to be induced,and i lost down to 125 within a matter of a month and a half.i was doing so good with my weight loss.i wasn't exercising or anything.i had just gotten into the groove of only eating one time a day and it was not bothering me or affecting my energy level.since being on the ring i am now up to 130 pounds and i am hungry ALL the time! after reading all of this i am seriously thinking about taking out my ring after i finish this post.i do need some form of birth control though...i am thinking an IUD???