Thank you all for the input!
I've e-mailed my manager about it, although she's actually an acting manager... that makes it a bit hard, because she's leaving tomorrow! But she said it was fine, she has the same thing right now.
It's probably a bug going around work.
I really love my job... the only stress is purely physical because my shifts and sleeping schedules change every week. On the other hand, it might just be the open air office environment. A lady who was leaving our department once referred to it as a "loving petri-dish."
The company actually got us all flu shots. (which I got... figures I catch everything BUT the flu!)
I can't work Saturdays and Sundays to make up for it, unfortunately. This is a strictly unionized work environment, so working overtime after being sick strikes me as a bit insulting.
If I was on salary, that would be different. ^^
I was lucky with the shingles! I got the anti-virals just in time, so I really only suffered pain for a week, most of it on a long weekend.
I suppose I'm mostly worried because my parents are onto me about taking too many sick days. They say I'll get a reputation for being 'sickly' and never get promoted. But I feel better now... thank you all for the input!