Be ready for the severe detox to last up to a couple weeks to a month and then mild detox for another couple weeks.Then your body and mind has to detox from the effects of it can take some people many months to return to normal sometimes 7-8 months to longer.
It depends on many things: What dose you were on, how fast or slow your detox was, your weight & metabolism. Since Methadone is stored in the fat, it is very slow moving through the system.. So it could take quite a while to feel completely normal again. I detoxed 4 mg a week from 100 mg down to nothing. It took me 3 months after my detox was over to feel normal.
Detoxing off methadone is hard and the symptoms can last up to 4-6 weeks everyone is different some people their symptoms last longer and some don't last that long at all it really all depends on the person itself, some people may not even get their sleep back for months, and some people get their sleep back within 3-4 weeks, good luck