Qualifying exigency leave, like leave for a serious health condition, is a FMLA-qualifying reason for which an eligible employee may use his or her entitlement for up to 12 workweeks of FMLA leave each year.
Considerations. You can change your calorie intake during training if you feel it is necessary. If you're gaining weight, try eating 200 calories less per day. Likewise, if your training is suffering and you lack energy, you're probably not eating enough, so add in an extra 200 calories each day.
There is no reason to change that for a race. The only thing you really need for your half marathon nutrition is breakfast two hours before you run and enough fluid to ensure you are hydrated before the start of the race. You might find you need water or a sports drink during the half marathon.