I suspect most of us could write on this thread all day without repeating ourselves ... except when we forgot what we wrote. I have some of these, especially the dry burning eyes.
However I want to focus on the really weird ones here.
On the theme of smells, I could smell paint as a child. Dry paint. This was in the days of oil based paints. I could smell them. I could also smell it on anything that had been in contact with painted surfaces. Everyone thought this was bizarre. Since everyone moved to water paints this problem went away.
But the one that takes the prize is the day I started feeling really weird, something like severe vertigo. I turned this way and that. Somehow I turned one particular direction fast enough that I felt something different. I started spinning in place, I think sitting on the floor, like a top, and it kept the vertigo under control. Then I got exhausted and had to stop. Back came the vertigo. I think I had some kind of inner ear problem.
The next big one was when I had a flu. Then oral thrush as my immune system was down. Then I started hallucinating. Smelling colours, hearing smells, my senses all jumbled. I went to the hospital with that one and all they did was give me an antihistamine.
One that was interesting, weird at the time and a turning point, was I always (as an adult, not sure as a child) had dead pale hands. No colour. I was on immunocal for some months for my CFS, as a glutathione promoter. All of a sudden my hands went bright cherry red. I mean, I would have given Rudolf competition, they almost glowed. I had to see a doc anyway so I mentioned this. However by then my hands had a healthy pink look. I think I had sudden major vasodilation in my hands. Anyway, since that day some fifteen years ago my hands have always looked normal, no longer pale.
(PS As a side note I was studying biochem at the time, and my hands were so red I thought a red pen had leaked in my backpack and gotten all over my hands at first. I even searched the backpack for the mythical leaking pen.)