I can fully sympathise with you Martin, I had 3 kidney stone attacks some years back, and wouldn't wish the pain on my worst enemy (not that I have any enemies). It finally stopped after having a lithotripsy, where the stones are shattered using ultra sound. The doctors found that my stones were caused by too much uric acid, which normally results in gout, something I don't suffer from. The treatment was to take Xyloprim for the rest of my life, and this is working as I have had no further attacks for more than 10 years.
Peter.