I was given morphine, demerol, dilaudid and toradol all at the same time during and after surgery. The morphine was an epidural during my bowel surgery, I was allergic to it so they switched me to a demerol drip, gave me dilaudid through my I.V. and gave me Toradol injections. I too was worried about them OD-ing me on so much pain medication but they said I was being closely monitored and not to worry. When I was being discharged from the hospital I was told that there was going to be some damage to my central nervous system due to all the different pain medications, so I guess I did have to worry after all! The only effect I noticed was strong twitches and kind of a jumping when I was trying to lie down to sleep. This continued for several months. I'm almost a year post-surgery and I only have the jumping/twitches occasionally.
I did not become addicted to any of the medications but I did develop a dependency on the Tramadol that was given to me in pill form to take home for pain. I was not advised that I would need to taper, and I had taken it for 8 weeks straight. I knew I was dependent because I would pick up the pill bottle, surmise that I really didn't have enough pain to justify taking a pill, and would take one anyway. I had to go cold turkey (that sucked) but I'm completely fine now.
Hope some of this info helps.