Chin up Pikey
Not that I'm an expert in overtraining, but if you have been training for 12 days solid the way you pushed me through workouts you will certainly be drained mate.
Re: going through treacle I know exactly what you mean on that front - in fact last year I had a period like that and I ended up doing tests on Tickle.com twice a day to see the affect work/life was having (a drop of upto 35IQ points...)
I was too stressed, over taxing my CNS, diet wasn't giving me what I needed, too many late nights, not getting enough sleep.
Its not long until the contest now mate. Your vascularity and condition was there when we trained mate - I'm sure its just a temporary blip.
Keep up the hard work mate.