pain
"I was placed under general anesthesia for surgery.  In recovery the tube placed in my throat for inhalation had not been removed before I woke up.   I was in a panic.  I was screaming in my head that I can suffocating and yet in reality no one could hear me.  I had been given dilaudid along with a few other medications.  Later in my hospital room I where I was again given dilaudid.  I was not able to get anyone's attention, but felt that if I fell asleep I would never wake up.  Either the experience or the medication caused me to have to concentrate on just breathing.  For pain it was great, but for breathing it seems like a nightmare."