you are prbly already back but whatever...
do what everyone else said.
dont get too sweaty or wet out your down jacket, its harder to warm back up and your down is now toast...
dont sleep in low areas where cold air collects... (lakes, ravines)
plan to spend an hour stomping out your camp pad, more for building a wind wall
be generous packing and eating with your food, midnight snickers goes a long way... u make the heat, the gear just holds it in. big dinner. bonus cocoa. extra snax.
maximize the fat to weight ratio of your foods.
peanut butter, cheese, chocolate. (pre cut them at home so they are snack size and you can actually fit them in your mouth when frozen solid)
a camp stove is your freind...
melt your snow with a little bit of liquid water, or you can actually BURN the snow it and it tastes gross