Opiates are awful, very fast addiction cycle and hard to come off. Never taken more than 2 days worth. The only time I had intravenous Morphine I hated it could feel it rushing through the system exactly how Heroin is portrayed on TV, I wias rough for 24 hours after so not sure I could get addicted to that.
The morphine I had in hospital gave me hot flushes, feel nauseous and I threw up twice - something not recommended after stomach surgery. I switched to tramadol without problems although they do 'space you out' and make you feel drowsy. However, they did the trick. The other thing to consider about opiates is they do constipate you - everyone remembers the 'dirtiest toilet in Scotland ' scene in Trainspotting where Ewan McGregor gives up heroin and gets the sh*ts.