There is absolutely nothing wrong with needing a break. I've heard some states or cities have a temporary foster care program. I have never checked into it, so don't know anything more.

It is exhausting work to raise kids. Mentally, emotionally, physically, financially. Don't beat yourself up for feeling the way you do. But think whether you really do want to stop being a mother. Could be you just need a break to recharge and relax for a bit. And do not underestimate your importance to your family. No one is perfect, everyone makes mistakes. You are doing what every mother since time began has done: your best! It doesn't mean you do everything right, but it means that you do based on what you believe to be the right thing.

Give yourself a break. You're doing a fine job for a fallible human mother!

P.S. Have you told your husband how you feel? If not, you should.