The best thing would be to simply work less hours. Say 28/week, but they would all be good high productivity ones. Unfortunately it would be a massive pay cut too, because employers don't think that way.
Now that I know I have celiac and can manage it by avoiding gluten, I just have chronic pain and inability to eat without not all of the autoimmune madness. This is a lot less uncomfortable but I am surprisingly almost as unable to work fully.
Work gatherings based around food are a huge problem, now and then, in several ways. For various reasons, I always got felt sick after eating at restaurants.
I'm curious because I have similar fatigue symptoms. But I had stopped eating wheat, so I had assumed it wasn't celiac. (Can't test without doing a gluten challenge)
But I completely agree that being self employed is the best way to handle this, and also that it is a major setback to productivity. My symptoms have improved in the past eight months or so and it's felt like an incredible blessing to simply have some normal days.
There is something called refractory celiac, which is permanent digestive damage. My mother had that and much of her small bowel had to be excised. I may have that issue. I’ve recently been to the hospital and have a few biopsies pending.
Funny thing is that I'm very diligent and if they asked me how I feel about _helping them out on the project_ I would've gladly tried to stay longer whenever the pain allowed me to do so, but this way it felt like a slap in the face.