Are you taking b vitamins, or are you sure you are getting enough of them in your diet. I know you are pretty knowledgable about things, so you probably already thought of the b2 deficiency thing, right? It could also be an allergy to a certain food or drink you are consuming. Changed or added something you weren't using before your battle began? Say, nutritional yeast or kefir? If you have a problem with yeast, your body doesn't care wether it's candida or the good for us kind, which sucks. Anyway, just some things to consider.