I'm tapering off methadone, I'm done to 10mg, but now I'm having kidney pain. I've drank water for 2 days, thinking maybe I was getting a kidney infection, but it's not helping. It's not my back hurting its on both sides! I've come down from 45mg to 10mg in the last 10 days and I have 1 1/2 pills left. Tomorrow will be 10mg, the next 5mg, I'm doing it the best I can, but I dont understand the kidney pain.