I have left flank pain (feels like my lower left rib is bruised, but I see nothing), my urine has been dark orange almost red looking. I have lost about 23 lbs in 2 weeks (not intentional). I am extremely tired, have muscle cramps, and i drink about 7-8 bottles of water a day. I do not have a thyroid, and have a history of phylenephritis (not sure how to spell that word).