Moody Cranky Advice

I've been cranky, moody and wanna-be-uber-weepy this semester. At least once a week I have a day when I really just want to curl up in my office and cry. Not cry about anything, just cry.
Actually, moody isn't the word for it either, since I haven't been in a bad mood and these spells overtake me without much of a change in my mood. I don't know. There have been some blue or down times, so very tired times, some rationally irritated, some irrationally irritated, some worried times (see my blog when I eventually post about ventriculomegaly, which I just looked up again for the spelling and am re-concerned about) but those are mostly just normal emotions. This season I've also had spells of feeling emotionally really bad that felt like a physical symptom, rather than an emotion.
Anyway, this is fairly new territory for me. I think I have a fine grasp on the long-term- this certainly doesn't feel like it is inescapable or permanent. I can definitely envision that my hormones will change and that I will feel better. It's the short term that I'm having trouble with.
I don't want to explode at/cry at/nag my wonderful Mister any more than he actually deserves. I don't want to feel any fatter or lazier from sitting around eating and doing nothing than I already do. I don't want to be any farther behind in work or life projects than I already am AND I REALLY WANT to explode/cry/nag/eat/sit and do nothing.
Any advice for how you deal with ickiness you know will pass in ways that will make your loved ones still want to deal with you after it has passed?

Baby update - it's a girl!

The ultrasound appointment yesterday went well, and it looks like we're having a girl! I'm delighted, since I had a slight preference in that direction (though if it turned out to be a boy, I'd probably convince myself that's what I wanted all along anyway). My husband is already plotting how to intimidate the first boy she brings home. I keep wondering what she'll look like - my money's on brown eyes and dark brown hair, but from her Swedish side there is the possibility that she could be a blue-eyed blonde. Will she be a shy quiet one, or a firecracker? Girly girl, or tomboy?

She is now 11 ounces - as my mom says, nearly the size of a can of Coke. Though some days I could swear that what I'm carrying around is a brick. Of lead.

The ultrasound now shows some very neat details other than the gender-specific ones - toes and fingers, the four chambers of the heart, little specks of kidneys.

Next week is week 20, which marks the halfway point. I know all too well that I should be patient and enjoy the luxury of sleeping through the night while I can, but I want it to be April already!