Hi SD_AutismMom. I'm sorry about your son's condition and all the suffering associated with it.
OK, you know by now that thinking outside the conventional medical box may yield some useful answers.
The #1 cause of chronic or recurring pancreatitits is alcohol.
Candida (yeast overgrowth infection)has been strongly associated with Autism, as a factor.
Autointoxication is one of the common effects of Candida, as
alcohol and acetaldehyde are the products of excessive yeast
and sugars fermenting in the body.
Gut dysbiosis is another serious consequence.
Note: Candida may not get diagnosed with conventional tests.
The ongoing -for many years- autointoxication (possibly low grade) leading to Pancreatitis , along with Gut Dysbiosis, is probably enough to explain the significant abdominal bloating.
I'm sure there are other suspected causative factors, like mycoplamsa or other underlying infectious conditions, hypothyroidism, hormonal/nutritional/vitamin deficiencies...
What meds is he on and what is his special diet?
Oh, BTW I also suspect significant neurotransmitter imbalances.
Any testing for that? Any genetic testing?
Looking forward to your response.
have a food allergy test done to rule out any foods or drinks he is consuming causing the bloating. Also have a comprehensive stool study done, this will test for Candida overgrowth and parasites, both which are known to cause bloating.