Yep twice, and doctors told that it is probably one of worst type of pains human can experience. First time, I was puking and I thought that it was from mushrooms on pizza but later I've found out it was reaction to pain. Both times lasted several day, it is complete agony,and that someone offered to me to kill me in those moment's I would accept, just to stop feeling that pain. You are completely paralysed from pain and can't think properly.
Doctors told me that on my weight I must drink about 3 liters of water every day and stop drinking Coca Cola.
Anyway, there is no way that you can understand people with those problems in case you don't have one. It sounds stupid and like you are a weak person, but this is great lesson to learn how fragile humans are. Also, if you want to shoot someone and leave it suffer, kidney would be best spot
