What is a good way to address this with my doctor without me being pushed aside like it doesn't matter?

I want to go to my doctor about this, but I'm afraid she'll push it aside. She already has with a few of my previous problems. For this reason and many others I have come to distrust the medical community. 

Does anyone here actually know why pain occurs during sex after months or even a year later? I am 5 months post partum. I have actually been having this problem on and off since my very first child, but at the time I was living in the U.S. Now being in Canada I think I can get this addressed. The pain has gotten worse with each birth. I think I might need surgery.