At the risk of going against the grain, I would ask for an epidural early on - that way the pain won't be there and you can actually have a sleep during the process if it is a long labour to help yourself to re-energise ready for the pushing.
I like the hypnobirthing suggestions of others; I think I would go for that if I were having another natural birth as it would be wonderful to have a relaxed state of mind and not feel afraid.
I too ran out of energy due to hunger, and because I felt nauseous i couldn't eat. My dd was posterior until right at the end, and my labour was 32 hours, 28 of which was active labour. Because it started early morning I didn't eat, and by the time it was full on labour I was past eating and it really took it's toll. We ended up transferring from a homebirth because of that reason, though I am still happy with the way things ended up I really suggest doing everything you can to keep your energy levels up.
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