Could a tubal ligation be the cause?

I had a tubal in 2007, and I have some isolated pain as well, but I have always thought it was due to my last (of 3) c-sections. Maybe you should get a second opinion from another OBGYN, especially if you are so bothered by it. A condition that effects the quality of life should be taken seriously, and it sounds as though your doctor does not understand that.