I don't know if or how this applies or not, however, i've been dealing with c diff infection the last few weeks and I can honestly say that these are some of the symptoms. Cdiff is not just the rhea, it affects a lot of systems. Now I know you are not having rhea, a lot of people have zero symptoms but harbor this bacteria. Is it possible you have the bacteria in your colon and know not? Are you using cayenne pepper daily? How much IO? I'm curious if Iodine kills the pathogen in the gut or not, waiting on an answer but I got rather yappy in my post!
The tongue part you mention was driving me nuts, I had no clue what it could be from, it just poppped up out of the blue before I took a nose dive. I also have spoken to someone who had the same symptoms but she did not test positive, however, that means nadda these days without sound tests for many things.
For your eyes I would suggest Schulze's or Uny's eyebright. Ohhhh, it hurts but works so good! I use Schulze's but plan to try Uny's.
Good Luck! I know this is random but anything is worth investigating!