Bike Overload

Just coming to the end of Bike Overload week, in excess of 400 miles in 7 days including a 160mile ride into a head wind all the way - talk about hard. At one point I was doing 8mph with a HB of over 150. This week has also included 2 long days in the Welsh hills running and walking, a 50 mile mountain bike ride and a 150 mile return ride in the pouring rain (what fun - 8hrs of none stop spray) result - I'm now completly shattered. I've promised myself a couple of easier days now to try and recover a bit before this weekends sprint Tri at Leicester - although I don't expect too much in the way of a decent time . With 8 weeks to go its all getting nervous - when can I start tapering beacause I'm shattered.