I was on 80mg's of Methadone & came off of it cold turkey approx. 8 years ago.  It was the WORST ExPERIENCE of my whole life!  It took me about 6 weeks for the withdrawls (sweats, stomach cramps, muscle pain, diarea, vomitting, twitches, uncontrolable leg twitches.) 

 

After the 6 weeks it STILL took me @ least 6 months to feel 100% back to normal & to this day I still experience cravings to this day!