YK most of the pains in our body are without any reason ,you acknowledge it's anxiety it's making you think all that way.
maybe it can be something else
just get a check up mentally and physically
I'm not saying that it's not anxiety it's just I used to have stomach pain and threw up quite often I neglect it thinking it's my food anxiety but it turns out to be appendix . later I had to go through a surgery because of my Neglecense