Follow-Up:
I have had the very "sour" then "salty" then "sour" taste in my mouth off and on for about 3 months. Recently, the intensity for "sour" increased. The Dr. thinks it's sinusitus. I have been on antibiotics for a week and there is no relief. I too have read that it might be a vitamin deficiency (ZINC or B12). I am going to try Zinc first and am taking a multivitamin. The tastelab.org website for phantom taste that was recommended is under construction and won't be available for a few weeks. If anyone has any information on what they say, please let me know. Going crazy...