I am glad you are getting them fixed. My incisional hernia (thanks for the term as I went into brain cramp) was painless but I could wiggle my belly button and feel it. The intestinal one in hindsight was showing symptoms. Cramping gut, feeling of not emptying when pooping, bad abdominal pain sometimes after eating, etc. That being said I think all are a pretty quick and relatively easy fix, so good luck..
and I am told that hernias are very common in our population from the massive weight loss.....I guess there is extra room for stuff to move around and get kinked up and with the incisions the wall of the abdomen is weaker in general.
Best of luck!