I never had pain on the right side. Mine was more like an
upset stomach feeling, acid reflux.
When I had pain it traveled, sometimes on the upper or lower left, or lower right. Never where it was suppose to be.
You have a good chance that your stones are acting up. Mine did after 10 years.
So you might as well start flushing. It really helps.
When you don't feel well. Take a glass of water with a tsp of epsom salt. If the pain goes away it will indicate stones.