There are lots of things that can result from bad eye sight.
I didn't get headache from my bad eyesight (around 1/2 dioptrin), but easily got completely tired during work (no matter how much I've sleeped during the night). Since I've got lenses this issue disappeared, no more tiredness at all during the day.
If you are tired and your eyes are ok, you might want to check for allergies (at least mine didn't have any effects on throat/nose, so it might not be obvious). Or bacteria infection (teeth, etc).
I didn't get headache from my bad eyesight (around 1/2 dioptrin), but easily got completely tired during work (no matter how much I've sleeped during the night). Since I've got lenses this issue disappeared, no more tiredness at all during the day.