I Am An Alcoholic And Have Been Taking Drug Screens

i am an alcoholic and have been taking drug screens since november ..i have passed all tests....i was screened on 5/11 that screen was fine i was tested on 5/13 and 5/21 and tested positive for methadone..i do not take prescription drugs let alone illegal drugs...i take water pills.. ibuprofen.. one a day vitamins and tylenol. i found out today about my drug screen i went to a different clinic and took another urine test and a mouth swab to try and clear my name. the lab is doing a confirmation on my two screens that came back positive. please help i could loose my kids because of this