Last week was the busiest week I've ever had, I really wasn't looking forward to it at all, 7 days of constant stuff planned I had to rush between and get done. It wasn't great fun, but I got through it. (I won't bore you with the details).
One thing I did find helped was to organise something for the day after it all finishes. That gives you something to look forward to and remind you there is a light at the end of the tunnel. Helped me, and made that thing ten times better than it usually would be too.
Other than that, stay positive, and get plenty of sleep. Set yourself shut off times for work/reading; a time when you will put it all down for the evening and have some wind down time. It may mean you have to work 110% during the day to be able to allow yourself that free time, but I always find that much better than working at 85% non stop from the minute you wake up until the minute you fall asleep.
Good luck!