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In my experience high levels of histamine are possibly involved, which can cause irritation and inflammation. Abnormal gut flora can cause excessive histamine. If you goggle histamine you can see the disruption it can cause. Some foods block the enzyme that breaks it down and others can cause you to produce more. It is a very interesting subject. I am having some success at last. The foggy feeling is gone, as is the blurred vision. The mucus is clearing and my throat is no longer sore. It is early days. I hope this posting can help others, as the medical people are not interested. Good luck to your all and good health.