I have just done a 50 hour methadone detox to go on to subutex (so i can do a quicker detox) and i have to say that i was ill i was aching and cold/sweating off my food not in good spirits really not sleeping , very irritable emotional sneezing and yawning where my eyes were watering and i was only on 18mls of methadone so he has got to be taking something Valium maybe?? as i do know people who have done a heroin or methadone detox and taken Valium i would ask him.