Fuelling is definitely key. When I first started cycling recreationally last Sept (only ever done 10-15 mile e/w commutes before that) I never bothered bringing water or food with me. That was fine for the 30 mile routes I did at first but on my first 60 mile attempt I started slowing significantly at the 40-45 mile mark.
Since then I've made a point of having a decent breakfast beforehand and especially on that windy, hilly 90 miler I did last weekend I was popping gel shots and raiding feed stations for cake and jelly babies at every opportunity. It without a doubt made all the difference. It's important to fuel up as soon as you feel your strength slacking a bit, if you get to the point of proper exhaustion you're as good as screwed.
Since then I've made a point of having a decent breakfast beforehand and especially on that windy, hilly 90 miler I did last weekend I was popping gel shots and raiding feed stations for cake and jelly babies at every opportunity. It without a doubt made all the difference. It's important to fuel up as soon as you feel your strength slacking a bit, if you get to the point of proper exhaustion you're as good as screwed.


wrist/thumb sprained too(this was together with the elbow)
drink some cod liver oil capsules and at least 1ltr of milk a day and that'll keep your bones going. - this is what my doc said after i broke two bones in 2 months - which was a shock to him even thought it was more the fact that i was really pushing my luck on my bmx.