I felt it was harder to take a deep breathe but nothing extreme. If you find that it is extremely difficult or you are becoming lightheaded you should probably call the doctor. My stomach was sore the day after surgery more than I was prepared for, but try to remember that giant metal rods were moving around in your stomach and even though the incisions are small, you still had sugery. I brought some of my husbands Lortabs with me for pain so I had some relief. If you feel it is unbearable there could be something else going on and you definitley should call the doctor.
Best of luck and let us know how you are doing.