Definitely. The worst pain I had was after my second surgery when I had internal bleeding. I spent a week with a rugby ball sized haematoma in my abdomen, and even with oramorph, zomorph and tramadol I was in agony. I then spent another 5 weeks in agony in hospital as they tried to work out how to get rid of it.
I never ever want to be in that much pain ever again. It was constant, no let up, no position that made it ease, just agony.