Help!! I missed 2-3 days of sleep and can't get back on a sleep schedule!!?

I recently got back to the USA from China and ever since my biological clock has been messed up and I've been missing whole nights of sleep going out and working. It has been messing me up really badly. Its so bad I can barely concentrate on anything. I sleep a few hours one night then miss the next, etc. I have a headache that wont go away and my brain feels fuzzy. A few nights I stayed up all night reading. I have really bloodshot eyes and feel depressed. I've been back for about 9 days now.