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Call a let the supervisor you unable to work today. As needed.
You are allotted 30 days annually. If you fall ill your excused only by doctor recommendation where you'd places under sick in quarters until you recover. Those days are free.
30 Days of leave
We get 4 hours of sick leave per pay period
13 days of sick leave per years.
Earned sick leave per pay period.
Paid sick leave earned per pay period
Basically you work till your too sick to work, that is a choice you make because you don't just have your own advancement to worry about...national security and all.
After 3 days you must submit a doctor's note indicating you was under doctor's care. 13 days per year