Post-Op pouch question

Don't ask me,,, I obviously don't know what the hell I am doing. I spent Friday night in the ER. I got so stuck I was blacking out from the pain and was in shock when I got to the hospital. They pumped me full of fluids and gave me pain killers and a ct scan and when it was all said an done it had finally moved through and I was fine. I'm still sore with anything I eat but I am ok. But I haven't a clue how this thing works. What's fine one day kicks your ass the next. kp