I have had the acid reflux thing - been going for speech therapy and it has helped A LOT.... If you sing, and have some idea about using your voice then you make great progress once you are in the hands of a professional! Also drink lots of water - keep your vocal chords 'hydrated' - as for changing diet, well, I have something called 'silent' acid reflux, which means I suffer the damage but not the pain - just end up with a hoarse voice. I have to take antacids daily but the main thing is being aware of the 'false' vocal chords that close over to protect your real vocal chords when you suffer acid burn. A speech therapist will help - honestly!