I have been bleeding everyday for almost 6 weeks with pain in my pelvis and back. How serious could this be and what kind of doctor should I start with?

You didn't give much info such as how old you are or if you are sexually active but I suggest you start with an OB/GYN. A gynacologist will be able to find out if you have an infection or any damage or what is actually going on and everything the find out will be kept confidential. If you need to, you can go to you local health dept. and see one there. Good luck!