One issue for me when i was working early morning shifts (4.AM) i was drinking 3-4 cups of coffee in the morning. I had the same problems, waking up with extreme hunger pains and light-headiness until i ran to the fridge and ate. When i got switched onto the afternoon shifts, i decided to kick the caffeine habit and in about 2-3 weeks, my morning hunger died down dramatically. I'm still hungry in the mornings (naturally), however, i don't feel the pains and the light-headed feeling anymore. Don't know if it was just coincidence but if you intake a lot of caffeine, maybe try cutting back?

Mitch