Take a sickie, why not?
My dad was a workaholic, never missed a day even used to do three straight shifts when he was working at the coking plant.
Anyway ended up working at royal mail after the miners strike 30 odd years I think he did with out a day off, then he had time off because his knee ( work related but didn't want to make a fuss as he was a company man etc) needed an operation asap but his holiday days were all gone, anyway, had time off two months ish I think and received a final written warning for attendance!
You don't get medals from your employer or thought of any better, especially the larger companies, so why not, you only live once.
Also if you don't like your job/boss etc then go for it.