Hi Jen
Please don't worry about it, it happens, sometimes things just get on top of you and the stress finds an outlet [be glad that we are girls and can have a good cry, if we were men we'd have to punch a wall or something ;o) ]. I'm sure noone will think badly of you, as David said it just shows that you care about your work. Hope you can have some fun at the weekend and try to forget about the work for a day or two.
Take care
Ann