I think it depends on what is keeping you busy, and how much you are in control of those things. I found it really hard to allow myself to do enjoyable things because I didn't think I was coping with the things I "had" to do; eventually I ended up stopping pretty much everything - so it would have been better if I'd found some kind of balance before it got to that point.

I've generally found distraction to be helpful, and do quite a lot of puzzles (sudoku and that sort of thing) as it keeps my mind occupied but it's also quite relaxing to do as well - I'm not too good at listening to relaxation CDs or that sort of thing, as it can make me start ruminating too much.

Hope you can find something that works for you.