My Dr. Has Placed Me Back On Revlimid And Dexamethasone(

My Dr. has placed me back on Revlimid and dexamethasone( second time), which has dropped my IgG almost 1000 points to 2500a nd decreased urine protein down to 400. Suddenly in 1month time I have developed hypercalcemia and GFR abnormalidies( don't know numbers). My Nephroligist wants me to drink 5-7 liters of water/day which is impossible. Has the Revlimid caused this to happen? I'm on 15 mgm/day at three week intervals and dexi.40 mgm 1time a week.