There are two reasons that can cause a right sided abdominal pain for you, one being the gallstone, the other being the stone in the
kidney. the stone in the kidney has not caused any dilatation in the kidney so it is unlikely to cause significant pain. Your presentation sounds more like a stone in the ureter causing the colicky pain which can be missed on an ultrasound.
Next Steps
go for a ct urography if the pain persists after ensuring a normal
kidney function test.