hello htomassi, welcome here. I am really sorry you are suffering from this disease called chronic pain. I know how you feel. Doctors nowdays are afraid to rx narcotics.
You should tell your doctor you suffer and you will not be able to walk if he will not increase your methadone dose. It is like they do not know what is tolerance. They make believe, some of them cause of the DEA. Or you should look for another doctor in your area.
I wish you find a better doctor who can help you and understand you.