Women are lucky. When I was doing dope I got the typical meth symptoms: acne, sores, ashy gray skin, and that sort of malnourished, sunken look of someone who just doesn't eat. But 99% of it could be covered with a little foundation, some powder, and blush.
Good luck with work tomorrow and Monday. You'll get through it, in a few days the bruise will be gone and soon enough your coworkers will have some other drama to talk about. People are easily distracted.