Had a friend who suffered the same malady. She was on a plane when suddenly she started vomiting and had to be carried out in a wheelchair to a hospital. There she had emergency surgery and a foot of her intestines was removed. The problem was she was a bartender and only ate bar food, junk that entailed nothing fresh, no fiber and no veggies. She made it ok but learned a hard lesson.
I had this problem and it was a result of having my appendix removed when I was 15.
It really started to appear when I was about 30 and was having acid reflux problems though nothing was done at that time. I was taking Zantac 150’s like they were Tic Tac’s.
At age 45, I was completely blocked at the junction where my appendix was. The emergency surgery they scraped the excess scar tissue at that junction, and I haven’t taken so much as a basic antacid in the 15 years since.