Mal,
sometime, one needs a short break, what ever the reason... I am like that after a gap of "intence" activity/modelling. This is only some kind of burnout...
When I get to the bench, I feel lost and do not know what to do... and everything I try to do is crap... so I let go until I really feel the need to start again and this time it is with "full power"
Take your time my friend and get back to it whenever you feed ready!