Not up to it

Some nights you're full of cold, carrying a niggling muscle injury or sprain, not had enough of the right sleep or otherwise off colour. Doing my job, there are not a lot of options for ducking out of a shift and when you're there and signed in there really shouldn't be any way to shirk off the heavy stuff. You can't sit around when a fights kicked off, people are being restrained and emotions are running high. You can hang about the door and direct traffic, hold up the incoming, hold out the ejected, speed out the departing and try not to get too wound up.
On the whole you just have to get through it. You ask for an early night, you opt for the roles with a lower likelihood of being first on scene, and hope you don't end up running around every night. What you do is feel like shit all night and hope you can get your head down and get some proper rest. Other than that, I just try and be my normal cheerful, forgiving, open-minded, charitable self. Sorry, that should have read be my normal surly, judgemental, opinioned and harsh minded self.