take a break or something?

I have no idea why I can't keep my eyes open, at only 6:30pm. It was worse earlier as I was driving home from my mother's. I kept swerving and riding people's bumpers. I was given the finger a few times but I just couldn't help it. I've felt like a wreck all day. Thinking I had an UTI or Kidney infection or something of the sort when I woke up with tremendous lower back pain.
After taking most of the day off from work and seeing the doctor, all he could give me for an answer was maybe I was ovulating. Ovulating? I've never had painful urination while ovulating. I've never had back pain the way I did today. And I honestly don't even know when my last period should have been. I was told to take some tylenol and he'd let me know what the test results were in a couple of days. Gee, thanks Doc. That really helps me for the time being, doesn't it?
I've got Amelia in my lap, whose usually in bed by now. But instead she spent 20 minutes screaming. I couldn't take much more of that. The older 2 girls are occupying themselves in their rooms with their Nintendo DS and Leapster. All I want to do is curl up in bed and pass out.
Not so easy while being a mother of three. Your physically needs always come last. You have to make huge sacrifices to become a mother. And no, not just going to bed at 6:30 at night. I just wish at times I had that freedom to get up and go whenever a friend called. I wish I didn't have to search for a sitter or feel guilty because I was doing something that didn't involve my children.
All I can hear is Mia's new hamster, Cookie, running around and around in it's wheel. After a few hours of it, it starts to make my ears bleed. Can't the damn thing take a break or something?
I sure know I need to...