A kidney stone is EXCRUCIATING. Not just a sharp pain, you feel it on your right or left side, in your back, as well as in the front, its a sort of uncomfortable feeling as well as excruciating, you would be in tears, unable to move or do much of anything, you would most likely be cramped up into a ball moving around trying to find a position thats more comfortable ( thats an actual symptom) if thats what your expieriecing then yes its most likely a kidney stone, If the scan or xray didnt show it, that doesnt necessarily mean its not there, some stones dont show up becuase of what they are made of. It could be an infection.. The pain of kidney stones doesnt usualy "get worse" its one simple and horrible pain. The doctors will tell you its comparable to giving birth. You should get your blood drawn to test for infection