Had an episode of these buggers. Pissed blood one day thought that's not right. Called 101 and told bring in a sample, checked it they said urinary infection. Spent the next week off and on in pure agony! Travelled to Cardiff for Scotland game spent in agony. Was lucky to have arranged a lift back to Southampton in agony. Straight to bed missus was away. Had to give my Belgium tic away on the Mon night. About an hour later I was in A&E. Doctor explained I had an 8mm stone blocking me on one side and 2 smaller on other. He said we have caught you just in time your kidney is storing shite and about to burst, by this time they were shoving pain relief up my jacksie! Any way they stuck hemostrophy tube and bag in to drain it and kept me in for ten days until the infection cleared. It then took 2 ops through the japs eye and 3 rounds of sonic treatment to get rid! You have my sympathy.