Hi It sounds like your doctor is guessing. Most people with bile reflux have had stomach operations. If you want to be tested for abnormal non acid reflux events you need impedance testing. Not a guess from your doctor.
Acid reflux can absolutely NOT be ruled out with an endoscopy . 50 percent of people with GERD have negative endocopies -- no esophageal erosions--- nothing seen at all. When this is the case 24 hour ph testing is the next step to rule GERD in or out. The ph test is the definitive test for GERD .
Where you have throat symptoms you should also see an ENT to rule out any structural abnormalties in the throat and he can also evaluate you for LPR ( silent reflux)
If all of these tests are negative then functional dyspepsia or sensitive esophagus is a possibility. Good luck