It really depends on the scale of your addiction, and whether or not you actually use the methadone as a taper drug. Being on methadone forever is functionally no different from being on smack forever. Since it has such a long half life (designed for once a day, every day dosing - like some antidepressants) the taper will take longer than shorter-acting drugs like heroin. (The shortest are things like fentanyl and hydromorphone).
If you are at the scale where you can still complain on the internet about your pain, you probably should just wait it out. Smoke a joint and have a hot bath with epsom salts. A methadone taper will take much more of your time and money than a week of feeling sore. Really, the best option in my eyes is a taper with whatever drug you're using currently, but that's unlikely unless you have a strong willed friend to make you adhere to your taper.
Get off your butt and do some excercise as soon as you can. It helps a lot.
And remember, it doesnt matter what choice you make if you're just going to go back onto dope (or be on indefinite methadone maintenance). Don't make yourself suffer needlessly. If you kick dope, stay off it for a good long while.