Just thought I pass on the experience of a friend's over reliance on pain killers(Co-codamol), after a bad spinal injury. I couldn't understand her mood swings(just thought it was the lady's time of the month), but she had become addicted to them, even though she wasn't taking more than 10 x 30mg/500mg tablets a day. She said she was (and I witnessed it), scratching like Tyrone Biggums(one of Dave Chappelle's characters), this went on for a year. She managed to ween herself of them, but its took months. She really suffered from withdrawals that manifested as fairly deep depression. She did soldier on for the most part, but still ended up being of fore a week. A week spent sleeping and perspiring. If anyone else is struggling with this type of addiction, don't feel guilty and you can, will get through it.