Oxy OD is not, in any way at all, a pleasant way to die.
First comes incredibly fast waves of sweat and fever as your body races around trying to figure out why the fuck it's CNS is getting shut down
Then a sense of nausea, fear, vomiting, convulsions and eventually without any medical assistance, death.
It is not quick, or painless, or a, as some of you put it, "Great way to go out"