I've been rewriting a couple of chapters of my thesis. It's basically the most painful thing ever; I feel like I am living in a bubble of hot scalding pain.
All the same, I re-read my latest draft of the first of them today, with its more incisive analysis and wicked conclusion, and feel like it was all worth it. Hooray for some kind of pay-off!
Now... to work on finishing the second...
Update, 24 June: PAIN! ANGUISH! PAIN! PROCRASTINATION!