I'm 75 and in good health when I had the surgery for a hiatal hernia, That was a year ago on july 9. Like you I've had numerous tests done and each time everything has been normal.
I'm just now getting to where I can eat without severe diarrhea. I'm a long way from being back to normal but getting better. I also had my gallbladder removed at the same time as the hernia surgery.

Jump to this post