So he was taking 60 or more pills a day and never left pills around because he was worried someone would find them. Did he go get pills from a dealer daily? Did he sleep with pills in his pocket? How the heck did he takes that much and not leave them places?
Nobody saw withdrawals except his family. So in his desperate moments when not having pills no-one saw his withdrawals? I find it really hard to believe he just always had pills on him, never left them around, he never ran out when he needed to be working.. was so good at this that he didn't get messed up at work because he didn't have pills.. for 20 years?
This isn't really believable the way he is telling all of this. It sounds like "drug addiction" is his easy way out of explaining how he could lie, cheat, steal his family and friends. He can save face by blaming drugs for his behavior and not ever really having to take blame because at the end of the day he can say, I wouldn't have done it if I didn't do the drugs. So he says the right words to get people to feel sorry for him, but every time he can just say the drugs, the drugs, the drugs..