It's possible. But I am confused.. did you quit both the percs and methadone or are you still taking the methadone? I ask because methadone has a long half-life so it could be a few days before you enter full-blown withdrawal. Please - as mentioned earlier, talk to your Dr. again. Going cold turkey off these meds is NEVER advised.
Please keep posting and let us know how you're doing.
you might get lucky! i'd run with it! haha take it as it comes...you are doing great!