avoiding sugar, caffine and alchol, is the best tips out, for diet that is, but otherwise just eat healthly, and not forget your meals, skipping meals will not help, if work is pressing try taking a light snack into work with you, even a piece of fruit will help.
as for stress with people, god knows how to cope with that,

i have just remembered you saying you had problems sleeping is that work related or has the problem been solved