Not familiar with your ailment either, and adding Baking Soda a good idea. The reason for the burning is (probably) the acid iritating the bottom of the esophagus. Vitamin C is a weak acid, and it won't make your stomach more acidic.
You can get the benefit of ascorbic acid - without burning, bloating, gas or diarrhea. See http://www.livonlabs.com
Lypospheric C, but it is expensive.
Owen R. Fonorow, Orthomolecular Naturopath
My statements have not been evaluated by the Food and Drug Administration. Any product mentioned is not intended to diagnose, treat, cure or prevent any disease.”