At this time I believe the pain is from the brain making this nerve hypersensitive. I get different pains all over from sitting, walking or trying to hold I and even when anxious/stressed. While I was originally not thinking that taking topamax that a person mentioned got rid of her pain, it is an anti seizure medication and may have reset her brain back to normal. There are others and I know tensing my sphincter muscles for any period of time causes me pain which should not be. Sometimes after sitting when I get up and take a step it gives me a very sharp pain making me stop I then have to take another step and after a few steps it stops increasing and decreases and goes away so nothing was seriously hurting or it would not go away. I can give many examples why it is the brain intensifying the pains due to minor muscle tension or minor issues