Im sorry, *NEGATIVE STD results
I'd look for a change of dietary habits a year ago, or for a change of medications or vitamins you take, or a difference in your stress level, as possible culprits. Failing that, I would ask the doctor about illnesses and thyroid levels and other things that can have a systematic effect on the body. If you never tasted that way before and now you do, it just seems like something is different with your body in general. (I assume when you say your bodily fluids tast sour, you mean all of them.)