I really do feel your husband's pain and your frustration, cuz I have been doing it for 17 years.
I have not had a n EGD, I have had 2 endoscopies. My test was to find out if I had celiac disease, so the scope had to go into the small intestine. Lucky me, I have celiac disease.
The questions I am asking, are because I have had at least 3 episodes of loops, fluid, gas filled. In relation to my CIC (chronic idiopathic constipation). I am definitely not a Dr., but I can relate to your husband's episodic pains. One of mine landed me in the ED and ICU for 3 days with a nasal-gastric tube shoved up my nose and down my throat to my small intestines. YUCK! Sums up tat experience for me. I am definitely not trying to scare you. You really do need a GI, get a really good one. Mine was great for 15 of my 17 years with him. When he could not fix my CIC, plus other issues, he simply dumped me. I tell you this because even when he was good, he never gave me the whole story.

What did your doctor say about the fluid loops and dilation?
But you mentioned multiple fluid filled loops with dilation, showed on the CT. Yet you also use the word "normal " after vomiting.
Is your husband constipated or other poop issues?‼️
The words you used are CLASSIC features of small bowel obstruction, partial, in the process of forming.
Did the CT scan use contrast? Did it mention fecal load, fecal impaction(s)how many loops?
Redundant flexure(can be called splenic-for left side or hepatic for right side)? This is a 99.9% congenital variant, meaning an extra long large intestine (large colon) that must be crammed into the body and adds more curves for your poop to navigate through, so you can poop it out. I'm 65 5 colonoscopies, hundreds of X-rays, etc and I just learned last year that I have a redundant flexure. It's something to know about, but it's often patients never know they have it.
At 70, I assume he has had at least one super fun colonoscopy, did you get the results, report from radiology and your doctor?
Sorry I got so wordy, but I have first hand knowledge of the pain and that it can range from 0-10 on the pain scale. I wish you all the best success with this. Shelley