Prolong Bleeding!!! HELP!!

Girls....😢 I don't know whats wrong with me or maybe Its normal but I'm having prolong bleeding. My period has been acting up ever since I had it. First it was irregular then I had psos for at least a year, but I knew I was anemic but it still wasn't normal so I want to the doctor but they say it's normal so they prescribe me with birth control to regulate my cylce and balance my hormones. So my doctor said I don't need it now everything Is okay but the thing is my period last for 2 weeks or more and it leaks hard. I normally I would change 3 times a day and at night if I need to. And when I'm off of it, it's only for a week and I'm back on a 2 week period. 
What should I do?