How Do I Do It?

I am SO busy. I honestly don't know how other writers do it. They all seem to have full time jobs and children on top of their writing and it positively staggers me. Even without children I feel completely overwhelmed. Not that my life is especially easy, I am currently working three jobs. I work five days a week at a make up counter (trying desperately to earn a very piddly commission), I work one day a week at a home furnishing and decor store, and in my free time (I know what you're thinking, 'what free time?') I write for VerbNews. My work doesn't end there, in what little time is left I try to write. I edit my novel, I work at getting a freelancing career off the ground, and even attempt to have a social life. And, honestly? I'm exhausted.
I took last week off from doing a restaurant review for VerbNews because I was busy working on my first feature for them, which was very exciting. That's all done and turned in, so I turned my attention back to my restaurant reviews and attempted to book a restaurant for this week. No go. I couldn't get a hold of anybody until it was too late in the week. Now I have to do three next week, because I've officially had two weeks off and completely lost the lead time I had from doing multiples before. Which means I had to book a restaurant review on the anniversary weekend I'd booked off to spend with my husband. Damn it.
I'm not a happy camper at the moment, and it's got me wondering what it's all for. How can I be working three jobs and still be poor? How am I supposed to get any extra writing done when I have so little free time? And how can I sequester some special time to spend with my husband when I can't even keep my anniversary weekend sacred? I mean, it's not all bad, I didn't book it on my actual anniversary. But I'm mad. I was hoping for two days off, back to back, just for the purpose of having a fun, relaxing stay-cation with my hubbie.
Which brings me back to my original question. You know that old question, 'how does she do it?' Well, I'm asking it. I've read articles about hardworking writers who work full time as freelancers, have three kids and still manage to churn out best selling novels. I would really like a sample of the drugs they're on that they're able to be that productive and work that hard. Because I'm tired, and I don't know how I'm going to do it.