I want to try intermittent fasting but am worried how it'll affect my performance at work. Any advice on how I can do it during my nursing shift?

Just do it

I don’t think you have to worry about trying intermittent fasting. Because if you’re a nurse, specially if you’re working in a high level of care areas, it is notoriously known that we sometimes bypass or give up our own time just so we can give and finish what we have to do for our patients. You will know when it’s time to eat, after realization sets in and you look at your time and say, wow it’s been 16+ hours since I ate my last meal.