Re: First endoscopy (no hernia), today's (yes hernia)
I've had a couple endoscopies and a hernia was never mentioned. In my case they were about 2-3 years apart. Between the first EGD and second, I'd done tons of coughing due to my reflux (and a bout of Pertussis). My theory is that all the coughing caused the hernia.
My GI doc said my hernia was a sliding hernia. Basically, it would move around some and might not have been present during my first EGD, if I had it then.
I got good hernia confirmation through a Modified Barioum Swallow/ Esophagram.
You might try researching sliding vs. rolling hernia's. Most people have the sliding variety. Somethings the hernia symptoms in that case even resolve themselves.
Most of the time, doctors just don't do anything about hernia's and they aren't anything to worry about. If you start getting bad symptoms, you could talk further with your doctor. Otherwise, it is just something they will probably monitor over time. If they get extremely bad, surgery could be an option, but it is rare for that to be suggested.