actualhealth
Hi kandice, google 'left flank pain' could be kidneys, but may be not. a lot of possibilities on that side. fasting is a huge ph change to the kidneys. since its gone on for two days now i'd get thee to a doc just in case. might just be a back muscle strain, had that once, both sides. thought it was the kidneys too, so my doc sent a urine sample to pathology but it wasn't. took 10 days for the muscle strain to heal completely. maybe you stayed in one position too long. keep us updated.
all the best