Period Problems III? HELP?

Bwah haha this is sequel to periodproblems one or two. I complained to my mom about uber heavy bleeding, she says it's normal. I complain to my mom abut 8 day periods, she sas it's normal. This morning I complain about how durin the nigth i bled through my undies and pants and pad and make her wash them, she doesn't even think about the doctor. Since this is my 7th month she says I will be irregular, but there has to be something that will get me back to normal. Making her wash whenever I bleed through my undies I will do but I change every 4 hours now, I have problems sleeping. Please help! How do I get her to understand that I want a doctors appointment! (I'm 13 so I can't make one myself and she follows me around the doctor...is that even legal if I don't want her there?)