I get worried when I read things like women being pressured into pethidine or gas & air when they don't want it. I'm hoping that if you really don't want particular things they wouldn't do something like jab you with analgesic when you don't want it, right? And you'd have to breath in the gas & air, right? Is it more being badgered into agreeing to something someone would have not agreed to if they were in less pain and able to think more clearly?
I'm concerned because I know I have bad reactions to pethidine and gas & air (got pethidine at an outpatient procedure and ended hospitalised for the dehydration brought on by constant vomiting, when I got home I was incapable for 3 more days; gas & air produced immediate vomiting, never got enough of it to tell how bad it could be!). I'm pretty sure I'd have to be in awful lot of pain before I agreed to go through something like the pethidine experience again (and it's not like one's abdominal muscles are all peachy-fine after vomiting for four days).
I'm prepared for medically necessary things, but for just pure pain relief, I hope that as long as you continue to say "no", they can't force it on you? I have no idea how much a wimp about pain I'll be, but I already know I'm a super-wimp about feeling nauseated (I moaned throughout the first trimester, although I know mine wasn't nearly as bad as some), and am absolutely terrified of being as ill as I was with pethidine ever again.