http://www.medhelp.org/health_pages/Addiction/Hardest-Drugs-to-Withdrawal-From/show/74?cid=66
That's an article you should read. Methadone is listed as the hardest....and oxycodone is #4.
The psyc.dr is simply not informed! It would be a huge mistake to get on methadone to "help" with oxy w/drawals. There are many other good health pages on here (scroll down all the way, r.h. side) too.
You will need to decide for yourself, of course, but you'd be putting a stronger opiate in your body.....not less. And your w/drawals would be harder and longer. It still amazes me how many "dr's" out there know absolutely nothing about "harm reduction" meds. My psyc dr. was a complete wacko and never should have put me on subs. I should have just weaned off the hydros I was taking. Live and learn.
Your skin issues sound horribly painful......have you already sought all the help you can thru dermatologists or other internal med people?
I'm glad you are posting. Hopefully, you will be able to decide for yourself what is best.....and I'd look in to any nutrients you are deficient in, too
Your body sounds like it is asking for something.....dunno....just thinking outloud with you.
Blessings to you~