There is A LOT of additional legwork and investigation required to get to the truth even if you're brilliant Sherlock Holmes (and most won't be).
The best they can practically do in the 10 minutes they spend on your case, is try to treat symptoms.
https://meded.ucsf.edu/sites/meded.ucsf.edu/files/inline-fil...
I got all the additonal tests though. I got upper endoscopy, a appointment with ent who put some sort of scope down my throat, bloodwork, esophagram, barium swallow test. He said he got nothing else and i am on my own and admitted that almost 90% of time they don't find anything.
Mind you this is one of most common conditions not some rare disease that needs sherlock holmes .
Doctors also never want to admit they dont know the answer to something
Any of those could be a reason.
I personally know couple of doctors who themselves are clueless in fixing their own chronic conditions. Let alone helping someone else.
Sure go to the doctor if you broke your arm but they are totally out of their depths if you have any chronic conditions. Not sure what exactly they study for like a decade if they don't have answers to almost anything.