The other thing that I forgot to mention is that there is another way to go off methadone if you need to, and that is for your doctor to calculate your dosage of methadone into another long acting and short acting opiate in place of the methadone.
If the coversion is done correctly, it is a smooth transition from methadone to the new opiate . I've done it twice since being back in pain management and my pm wanted me to try methadone again , and each time I didn't tolerate it as well as I once did long ago, so he simply coverted my methadone dosage over to the new pain med and used long acting and short acting to create my new dosage on the new med.
It works rather well if the doctor is familiar with the conversions from other opiates to methadone and back again, you won't notice that you switched.
Don't worry, if you feel that you have a decent relationship with your pm doctor, discuss your fears and see what he says.
I truly hope that methadone works for you, I know the titration is horrible to have to go slowly with, but there is a reason for it, to watch for negative side effects and to see how well your body responds to the methadone and so that your body adjusts to the side effects slowly. I know that you know all of this stuff, but just wanted to reassure you.