I think you said you've had it "looked" at ten times or more and they all said there was NOTHING structurally wrong with your butt--and that it's anxiety and nerves--ergo the definition of TMS. I'm going to go out on a limb with this one and do something I don't normally do and say that
maybe it's TMS and benign. Also ask the doc about the Voltaran suppositories, for relief of your pain--not to cure anything that's caused by TMS, or I'm never talking to you again--put a note in your pocket, or in some
other spot so you don't forget. I am curious as to what he has to say about them--you better not forget! It sounds like due to your enhanced focus on your alimentary system, you may be in contention with this gent, for a spot on England's Got Talent, this is not one of Santa's elves :