Tingly jaw, odd neck, small veins?

I have found that one side of my head will start to tingle when I am severely dehydrated or undernourished. My extremities will clench, and one time my lips wouldn't stop pursing. I suggest you take a minute to sit, drink some water or Gatorade and eat something. Anything potato (or starchy) will bring your blood sugar back up a little faster so grab some chips or french fries and force yourself to eat.