This is an excellent recommendation since there are a few threads that specifically discuss this. I suspect your conclusion might end up being travel to the Mayo Clinic for a few weeks for diagnostic testing.

Some employers have their own health concierge in their benefits package that often goes mostly unused. I've heard positive feedback about the Stanford Health Navigation Service.

This. Also look at One Medical. It's "concierge light".

Yes, along with Forward Medical which is a similar model but having tried both I think has better service/function

Thank you!