I am so sorry you are going through this. Bleeding and pain that serious needs to be investigated. I don't want to scare you but when my friend bled like that for weeks they tested her for cancer. I'm not saying you have cancer but something is obviously up. You could also be a major candidate for endometriosis. Or an ovarian cyst.
You deserve the best. If I were you I would go to the doctor and demand to be tested for these things. I would also not be afraid to state that discriminating against someone for their size could lead to a litigious action!
You are not crazy. You are ill. You deserve the best treatment. The BC pill ain't gonna fix it. You need a diagnosis. At the very least you need empathy.
I wish I could go with you and do the talking. I have been screwed over by many docs when I was first dx with PCOS; so I am very vocal about my needs now
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(((((HUGS)))))