false positive for opiates at clinic

hi so ive been on methadone for almost 6 years and have never, not even once dropped dirty for an opiate. i have been slowly, like 3mgs every 3 weeks or so going down and am at about 70mgs. i recently switched from drinking a shit load of redbull to drinking gfuel energy suppliment, thats the only thing ive changed in the last few weeks. i take benadryl or tylenol pm to sleep.

so theres the background info. anyways my councilor called me today and said that there was no methadone (but there was the metabolite) in my pee, and that also there was an opitate.

i have no reason to lie to you, i have NOTtaken an opiate. i feel like no one believes me and i have my girlfriend who doesnt use drugs super worried. anyways, i was wondering if anyone else has had something sim. happen. any help is appreciated. thanks