Ouch. It almost sounds like allodynia, a supercharged pain reaction that occurs in the skin. People with allodynia sometimes can't stand the touch of clothing on their skin.
I would see a doctor about quickly. He/she may be able to give you something to calm down the pain reaction (perhaps Lyrica). You may also want to try an over the counter topical ointment to calm down the area.
One thing you don't want, if this is allodynia, is for this increased sensitivity to spread.