I Have Always Drank Ginger Ale, But As Of The

I have always drank ginger ale, but as of the past month, it seems to be more acidic to my taste than normal. As of the past couple of weeks I have felt an odd feeling in the back molars, thinking maybe its my fillings, but as of thew past week, my toungue is whitish yellow, and looks funny, and It seems I have a kinda mettalic taste in my mouth. I have wondered thrush or strep, but my throat does not bother me. Its a sensation really and a taste. I drink water but it doen't go away. Have not drank ginger ale in over a week. But I am having a glass of wine and it seems to be settling it down a bit.