Everybody reacts differently to pain. In addition, when our surgeons root around in there, I'm sure they don't all do things exactly the same. A pulling stitch, unique swelling patterns, etc...there are so many things that can cause some to have more pain than others.
Still, it will all calm down once you've had a little more recovery time under your belt.
Have you contacted your surgeon's office and let them know that your pain med isn't sufficient fo the pain you're experiencing? I remember in the hospital they switched me off IV meds to oral so they'd know whether or not it would handle the pain before I headed for home.
You shouldn't be a lot of pain (a little, sure). You sound like your pain level is too high. When you call your surgeon, try to think of a 0-10 pain level chart and give them your perception of where you are on that continnum.