Doctors aren’t going to be very helpful here - 95% are incompetent. You should probably try to come up with a good and efficiently computable a priori dietary strategy (e.g. evolutionary ancestral diet, with the goal of minimizing the chance of running into defective metabolic pathways). I can’t think of any such strategies I’m aware of that would allow beer.
One beer every 3 months is proof my diet is a problem? For a condition you know nothing about? Really. Fine, then it's useless, and I've surrounded myself with idiots, all of my careful testing and attempts to understand my condition have failed.
This kinda of nonsense, where I debate the very meaning of "me" to some extent is tiring. Even if I'm wrong in all of this, I'm not harming you, you're someone online, but I try really hard to not be a burden on anyone I come in contact with. I actually try to be a net positive to the world, in my small way. It's already hard enough for me to wake up every day and face the world without just ending my pain. Don't make me debate my sanity while I'm at it.
I’ll have a chocolate donut about once a month.
I have to perfect in my diet for days in order to enjoy it no penalty. A second one is not an option.
Now that's probably appropriate for (say) 70% of patients. But what about the other 30% of patients whose symptoms or conditions don't fit squarely in the checklist? That's when some kind of analytical/critical diagnostic skills are needed, and in my experience, very few doctors possess these skills.
Once you're in uncharted waters, they're not helpful. In fact, they're often actively unhelpful because they refuse to acknowledge that some things might be outside their expertise and they either need to actually hit the books, or do the work to find a specialist who can help you.
It is crazy hard. It’s like tech support on a Linux running Oracle with grandma.
At least that's the theory.