Hi there:
I don't know a whole lot about Methadone, other than you need to be sure you are taking it under a doctor's orders, which I am sure you must be.
My friend is on this, and it has given her a life, so to speak. She was in terrible pain and on several drugs and trigger point injections before. It has been very effective in giving her relief.
I think it takes a little adjusting, but here in our area, it is prescribed by various pain clinics for pain and drug withdrawal.
Good luck to you and keep us posted on your progress.

Cathie