i had these exact symptoms once. it felt like something jagged inside when i walked. it was pelvic inflammatory disease - not the emergency it sounds like, just a big inflammation - yuh, it was scondary to an asymptomatic gonorrhea infection. antibiotics cleared it up.

around the time this occurred, i had a gynie exam & stole a speculum from the doc's office so i could look into things (ha) myself. as a future physician i urge everyone to steal speculums from docs. especially now that they're all clear plastic and disposable and everything. do it for the glory.