I made the mistake of trying to work the Sudoku in the paper this morning...

The result was that I've become very light headed and dizzy which is making me quite nauseous. Is this something you all have noticed? That is, when really trying to apply your brain power, it really brings on the symptoms?

After my initial injury, I'd say it hurt to think. Thinking would bring on migraines and whatnot, but I don't seem to be in the migraine phase these days. Now a days, thinking too hard seems to just make me dizzy and lightheaded. It feels like I've been holding my breath as long as I can, as if I'm not getting enough oxygen to my head.

Is this something any of you have experienced? If so, is there anything you have been able to do to help? Obviously this is a problem given that thinking is pretty important when working.

I want to think that I'm on some kind of road to recovery since this isn't bringing on terrible headaches, but frankly, these symptoms are just as debilitating.