In my experience, we just have to keep on moving through our aches and pains, and then somehow, magically, the movement ends up actually relieving us of the very reasons we are afraid to move in the first place. We have to be intelligent and not injure ourselves, but undoubtedly there are ways we can move that will help us. We have to be creative. But to stop everything every time we hurt sets us up for bigger problems down the road.
It is our job to care for bodies, but not to be so precious about them that we don't trust them to do what they can do. The body is made for movement. It's up to us to discover what movement is best suited to the day's aches and pains.
I keep on moving no matter what!