Hi Lily.
I dont know about everyone else, but pain can certainly make me feel sick and drive me to the point of exhaustion. Last October, i had a heavy blow to my shin from a truck axle. Followed by another heavy blow one weak later to the self same spot. Although i kept the wpund clean, it became infected, badly, I went to the hospital with it and had to spend the next ten days being fed antibiotics. right up to when i went to hospital, the agonising pain in my leg would make me feel so run down and sick its unreal. I eventually got to the stage with it, where i couldnt bear to have my leg hanging down, or any thing other elevated.
My back can also make me feel quite sick, but i believe the painkillers i'm on dont help.
Good luck and best wishes, Andy