please help can't take this pain no more

after I had my daughter sept of 2011 which was my second c-section since 2007. where my plevic bone is on the left I have the worst pain ever if I push done on go to stretch it's makes me want to cry. even during sex it can b painful!!!! I have had my Pap smears regularly and always get a STD test for everything and I have told my obgyn several times and does nothing. I did some research over the past year and I hope it's not what I have been seeing...