Hi @dennisjustin, welcome to Connect! I moved your post into this thread called "Chronic Abdominal Pain" in the Digestive Health group, where members are discussing chronic abdominal pain.
Having to watch your son be in so much pain over the past 20 years, and finding no answers, must be awful.
I’m tagging @mamacita and @astaingegerdm as they can provide some support for you as you help your son through this and continue to search for answers.
Was there anything your son did differently when the pain disappeared or was it random and could only be attributed to the intense pain?