maybe the problems between my ears

Lol, I hear that. I certainly have plenty of my own.

I also don't drink much caffeine at all, in fact, most days I have none. I find it messes with my sleep, and if I have more than a medium-sized soda in a short amount of time, I get a bit jittery. I mostly just drink it when I need to be more alert, like if I'm driving late at night or something.

Anyway, good luck, hopefully you figure out what's causing issues.