Try to stick to a routine. But, even if it is only a snack make sure you try and stick to eating at meal times. Often trouble in sleeping and nightmares play havok with sleep patterns, but try to stick to your usual waking up and going to bed times. As far as you are able try to stick to a schedule that is usual for you. It is way too easy to slip into bad habbits, but remember your body is struggling hard to overcome a great trauma, and it needs looking after to help heal itself.
Different people have different ways of coping with trauma.
These are just some of the ones that have helped me. If you have found ways that have helped you and would like to share them with others, mail me and i will gladly add them to the page.