@ske22 - I would be fuming mad after the kind of visit you had! Similar happened to me- my local gastroenterologist pretty much gave up on me and even ridiculed me.
Since we are living close enough to Mayo in Jacksonville I got a appointment there. It was frustrating too -over a few years -before I had a diagnosis of some autoimmune disease.
I was always met with kindness and interest- all tests were explained in detail.
Autoimmune diseases are sneaky in my opinion- they come and go, which is reflected in the way you feel.
I have to admit that my Mayo doctor also felt stressed when I came! However, there finally was a diagnosis- treatable.
As long as I felt sick 24/7/365 I kept going back for answers. You can’t give up. Just remember that your immune system is fussy and won’t always show what’s going on.