Oh my god, it saddens me so much to read this post about the lengths some of us have gone through to rid ourselves of such a horrible symptom, disease, or whatever the hell this is!
I just want to paste here a previous post I made about a possible cure for some and maybe most of you - TURMERIC. Please give it a try. You have nothing to lose. It is cheap as hell compared to other treatments (I bought my 2 oz jar for $1.99), you likely already have it in your pantry, and according to many, it has many health benefits.
Cure:
Turmeric (I use the turmeric powder which is used for cooking) - pour a small amount of turmeric powder into your mouth (you can also mix a small amount with water if itś easier), rinse & gargle for about 10-15 minutes and then you spit it out (be careful as turmeric can stain your clothes so make sure to get as close to the sink as possible when spitting it out). Feel free to brush your teeth with is as well (your toothbrush will be stained but it doesn´t bother me). My routine is - rinse with turmeric once a day and brush my teeth with it every other day. The rest of the time I just use regular toothpaste to brush my teeth & floss and so far the sour taste in my mouth and the white tongue have just about disappeared. Anyway, I really hope you give it a try because it has really worked for me! Best of luck to you all!