I used those heating pads from Thermo whatever-the store brands didn't work but the brand name really helped. It sticks to your panties on one side and stays up against your cramping spot for up to 8 hours. Muscle relaxers will help too if they were provided for you. Have you tried reaching down putting in a tampon? OUCH! I needed the vicodin for that-lol.
I hope this works out for you-actually one of the "benefits" of all my pain meds is thatnow and then a period can sneak up on me and I don't know its coming! Never thought that would happen!