I would like to also say that I experienced the same pains and pale stool that you have. It surely can cause anxiety as to whether the organs are getting damaged by the meds or it is indeed die-off.
Both the kidney area pains and pale stools are gone now.
Each day/hour brings upon new anxiety filled aches, pains, even Charlie horse muscle spasms in the night. Accepting it as die-off lessens the anxiety thus lessening the discomfort.