Welcome to Just Answer and thanks for your question. That is an extremely high level of methadone, and you are right that there is no equivalent Suboxone or Subatex for that high a dose. Have you considered inpatient rehab to get your methadone levels down? You are given other medications to help with the methadone withdrawal and you basically sleep a lot and don't have convulsions. When you reach a level that Suboxone can handle, you are switched to that at a high dose and gradually decreased to a level that a private Suboxone practice can handle in the community.
I'm so very sorry to hear about all your troubles. I am not in Massachusetts. While it won't be easy, there is one serious thing to think about. It is so serious that I hesitate to mention it. If you are already in withdrawal trouble, they will take you to the ER and they will HAVE to help you...at least they do most places, and you can request inpatient rehab. Have you tried the psychiatric hospitals? What is the highest amount per day that they will accept? Once you are accepted into an in-patient program, the hospital is required to treat your symptoms. Clinical dosages are usually around 80-120 mg/day, so I really don't see what their problem is with accepting you at 100 mg/day. Have you tried pain management clinics? Have you gotten your insurance company involved?
I'm so sorry, but I'm really out of suggestions. I tossed this around at work this morning and no one here really understands what the problem is. You aren't taking a huge amount of methadone and our hospitals detox people taking this much (and more) all the time. One of the other experts agreeing with my last post is from the USA and the other from Scotland, so this is pretty much universal operating procedure. You may want to consider another state if you aren't receiving help in Massachusetts. It certainly wouldn't hurt to call around. While driving up to 3-4 hours isn't convenient, it is better than the alternative.