I woke up early this morning, 5:45am. I felt great, tons of energy, no hunger, no pain. So it was time to go for a walk. Grabbed my iPhone and headphones and headed out. Not a long walk, just about 1.5miles, back home in 30 minutes, and paid for it the rest of the day. Totally exhausted, stomach gurgling, gas pains, nasty headache, just felt like $hit. The only advice I can give anyone from this - is don't be like and don't be stupid. Going to take it a little easier tomorrow - will still try for a walk, but not as long and not as quick.