Oh man.... that is tough.
There are two ways you can go from here, as I see it.
Give the daycare a break. Can you work part time, and work around your hubby's schedule? Keep your ad up, but maybe for a date a little later in the future? I was advertising in Dec and having NO interest what so ever. I worked p/t outside the home for a little while, as I got things sorted out. It was not the worst thing in the world, as it gave me a little perspective, and since I wasn't completely invested in the job, I didn't stress too much. Now I am back, with my plans in place, and because I recharged a little, I feel like myself again. Do this so that you can save some money, and give yourself a buffer for when you re-open. Alternatively, you could take whatever kids you can get and work a p/t job in addition, but less hours. Just be super careful that it's not too much. You need down time too!
OR; you can advertise like you have never done before. Paper the neighborhood with flyers, maybe even expanding your range. You never know, you may snag someone who is willing to drive a bit. Door knock, talk to other moms at the McDonalds playplace, find out what it would cost to put an ad on your local radio station (if you live in a small-ish place, that is), put ads in every paper... and so on. Figure out what you can offer, without breaking yourself or burning out, that others can't. Extended hours? Fees paid weekly or biweekly instead of monthly? Are there a lot of providers around you that don't give receipts? I would promote that, if you do. Get insane and creative. Talk to all your friends and family, create a Facebook page, put it in your Twitter feed that you are looking. And most of all.... do your best NOT to stress over it. It's like a commissioned salesperson who hasn't closed in a while; if they (potential clients) see the dollar signs in your eyes, they are running the other way!
I hope that this works out for you.