Useless

I just feel like I'm floating out there, being absolutely without merit - to anyone. I'm probably just moody and PMSy, but this is WAY not my usual me - with or without the loveliness of PMS.
I try not to be needy. Mostly because needy people piss me off. But Katie posted her wedding pictures - which I took - today and I was going through labelling people in them and she messaged me saying I "don't need to do that," and that she was going to "have everyone mark themselves." And I was actually hurt. Like I just wanted to sit in my chair at my desk in the middle of the library and cry. That's not a normal reaction.
After that, I just couldn't motivate myself to do anything - anything productive in any case. I did do rounds before we closed, but just because I really didn't feel like losing my temper with my student assistants who have this talent for ignoring everything I say when I ask them to do something. Of course, then I had to send one of them around again anyway, because there were still people there, but in my circuit of the building I wasn't sure if people had left while I was elsewhere.
Of course, then when I got back to the desk, the student working was on her cell phone. ON HER PHONE. AT WORK. And this is not the first time I've told her not to talk on the phone while she's at work. What is so crucial that it can't wait until after we've closed? Furthermore, in what world is it acceptable to sit around at work and talk on your phone? And unlike previous cases, I actually sounded angry and censorious when I told her that she shouldn't be on the phone.
I'm just not dealing well with this ungrounded feeling. Like life just keeps heaping itself on my shoulders and I'm not coping fast enough and I'm going to drown in all of the stuff that I can't handle. And like everyone else is moving on and I'm just stagnating. Which is of course rediculous - which I tell myself, but mother logic isn't working today. I can't possibly be working in my field and in graduate school at the same time and still be stagnating. Can I?
It's as though I'm walking around in a fog and nothing I can do will dissipate it.

Or maybe I'll just blame it on the cold from hell that refuses to leave my body.