Painful Sex! Help!!

Melissa
Lately sex has been super painful...it starts out great but as soon a I actually have an orgasm it feels like everything freezes up. For the past few times, as soon as I get off the very next thrust I feel like my uterus is as hard as a rock and my husband's dick just hit a brick wall. Super uncomfortable. We've tried a few different positions but the same thing happens each time. Any suggestions? It's making me not want to have sex as much :(