i had double resection a few year ago,it was pretty painful as i was opened up and when i 1st got up to walk i was pretty tight around the stomach and it hurt like hell standing straight and trying to walk,even a sneeze was bloody agony,i was on light bites for a couple of weeks then slowly introduced normal food into my diet,i was pain killer free after 2weeks,got out after a week,everyone is different with higher or lower pain tolerance so dont beat yourself up about feeling sore,take what you can get for as long as you need it,and just take the food thing slowly,dont be flinging steak and chips down your throat after 3 days,
Hope you get better soon,