Hi @kathrina. Welcome to Connect.
I would think that it was odd, that when you exercise your pain is less, but I am recovering from a fracture that kept me unable to exercise much. My legs hurt a lot now but I find when I get exercise they hurt less! I am just wondering if that is something typical, that exercise helps to decrease pain. I think you have your answer there, get whatever exercise it is that helps you to feel less pain. I presume your doctor has said exercise is fine for you, but if not you should check with him/her.
I hope you let us know how things are going.
JK