What is wrong with me?

I usually stay up late, but increasingly over the last week, I've noticed my bouts of insomnia rise in strength and intensity. Yesterday I worked from 10AM to 10PM, and could not sleep until 2AM. Today, after a particularly distressful appointment with my lawyer, I decided to hike up a small mountain to take my mind off things. I'm out of shape, and what took a somewhat geriatric 50 year old man (I saw him arrive at the foot of the mountain from my moderate height--and watched him beat me to the top) only an hour to do, I barely accomplished in four hours. I nearly ped out half way up the small mountain, but luckly I was merely on the onset of dehydration when I made it back down. I thought I'd drink a lot of water and subsequently p out. I drank the water, but I'm still awake. My eye lids are burning hot. I know I am tired and should be able to fall asleep, but I can't. What is wrong with me?