If you are not seeing as GI dr, make an appointment. If you are and he is not progressive find another one. I had all sorts of tests but none showed the HH. However, when I saw the bariatric surgeon for my Nissen he was sure that I did have a HH. Sure enough after surgery he did tell me there was one there.
Next time you see the GI dr ask him if there is a definate test that will show a HH. I had an endoscopy and the GI didn't see the HH. I would guess maybe it is not always visable.
Hope things are better soon