If he was taking opiates there is almost always some withdrawal, even in small doses of consumption. My father takes morphine once a day and for the 12 hours without it hes always miserable. He only takes one 30mg xr per day. People underestimate the fear pill addicts have of "withdrawal days". They think they cant survive a day without it because they get flu like symptoms during withdrawal. "I have work tomorrow I cant get a fever"-- but in an endless cycle daily