It could be your body adjusting to the
methadone, but I never had that problem. If fact even though I've taken methadone for years, when I do get a headache, a couple
advil usually do the trick. But methadone shouldn't itself cause headaches but we're all different. Anxiety headaches, whatever. If it lasts too long, call your physician! Sometimes eating will help and even a cup of coffee. Hope you get relief but I don't think it's just from the methadone.