What does it mean when my coworker said he feels weird and its just one of those days for him at work?

Anonymous
So yesterday was not the greatest day at work. I came in late, then accidentally gave a customer the wrong food which he was allergic too and felt so terrible about it, then my coworker yelled at me for doing that and then after that i just kept my distance and it was just a really bad day yesterday and i kept on messing things up, and it wasn't even my first day anymore. Anyway towards the end, my coworker said he felt weird and just one of those days for him and he wanted it to be over and i told him well its over in 2 hours, and he said yeah were almost off. I wonder if he had an idea i was upset or something but anyway what did he mean by feeling weird?
What does it mean when my coworker said he feels weird and its just one of those days for him at work?
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