I've never had literal pain but confusion and feeling like "huh, what....huh I don't get it"
are very fimiliar. It seems to happen when my brain is on overload from working
too fast. I find if I can slow it waaaaaay down and focus super hard on one thing
that it goes away.
Try not to be so hard on yourself :-) learning to work with how your brain works
doesn't make you crazy. It just means you have to be a little more creative with
how you get things done :-)