Hi welcome to health care magic forum,
Dry mouth, white tongue, salty taste in mouth and burning sensation of throat usually sign of reflux pharyngitis
due to GERD or Acid peptic disease
Breathlessness and stronger heart beat may be signs of mental stress.
In my opinion just relax and take plenty of water as you do and avoid .
Take antireflux agent for a week and so .
But if no relief than see an ENT specialist
for an indirect laryngoscopic exam to exclude any pathological lesion.
In addition You may need a psychiatrist
help for a counseling session .