I am also one who can eat everything...foods coming out whole can be a problem when you don't chew enough. I always suggest trying new foods by themselves so you can eliminate ones that might not agree with you.
Was your stoma in 2005 higher up in your digestive tract? When they are higher up there isn't enough time for nutrients to be absorbed and you'll lose weight, not gain it
I definitely don't have THAT problem
During your post op days you have to be careful with blockages because your body is swollen from surgery. Once you've recovered most people can go back to eating as they did before. It's very individual...just like our reasons for having stomas...so it's a lot of trial and error!