I have a 2 mm stone in my left kidney. While that is not that concerning, what is, is the fact that I have a sensation of internal pressure in my lower left abdomen for 3 months now. It feels like the large intestine in the area is swollen. I have had a colonoscopy and the doctor didn't find anything. They now keep telling me that its due to the stone. But this internal pressure sensation is just not going away. Could this be something serious?