Yeah, yellowted, I've had kidney stones and your description fits them pretty darn well. They are UNBELIEVABLY painful and it just goes on and on for hours. They've got new, easy ways of getting rid of them without surgery (the new method's called "lithotripsy" - check it on Wikipedia), but as bebop said, you do have to go as quickly as possible to your nearest ER (I know you call it something different over there but that's what we call it here). This probably isn't the best time in the world, weatherwise, to go to the ER in the UK, but you really do need to go. You don't want to go through that again. Take care!