I have had pressure off and on where the anus used to be for many years. It is worse when I wear something that can irritate that area. I have mentioned it to two doctors and they said not to worry as there is nothing left in there to go wrong. Not sure I love the advice.
Also, I am having work done in a couple of weeks for what we believe is adhesions that are blocking the tube from going in. I will let you know how it went and what the procedure was in a few weeks.