I took 10 mg of methadone 3 days ago for migraine. Have a drug test tomorrow. Female, 5'4", 170 lbs, 42 yrs. Plz tell me I will pass.

Most likely. The half-life of methadone is up to 65 hours. Just keep in mind is that methadone should only be chosen for treatment of chronic migraine after a trial of other safer medications.