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Trig - it's my experience that if you just write as much as you can - even if you hate it - you can always erase it the next day/morning/week. But, the act of writing it - no matter how good - might get you back into practice. I took a bit of time off recently and it took me a few weeks to get back into a groove (before I took the time off I was good for ten to fifteen pages a night) but you just can't do it unless you... As Alec suggested: Just do it. Just write, and eventually what comes out will make you happy. It's a discipline, and like any other you have to work at it and stay in practice.
Hope that helps.
I'm a little confused, if you want to write do just that.
Obviously this is a bit blunt, but without details of why you can't do it, it is a little hard to comment.