Is anything going to change if you stay at the present job? (The complaints you have do not seem to be temporary issues).
It would be a different thing if you took the job change because you thought you wanted to do what you are now doing, or if you had changed because it would help your skills.
If things are not going to change, why should you stay? You are working more hours at less pay, and your children are now in full-time day care.
No, you are not crazy. You did not ask for advice, but if I were you, I'd see if I could go back to the PRN pool, and -- assuming that answer was positive -- I'd have a frank talk with the current employer. Explain what you have said here, and offer to work out your notice (perhaps two weeks). I suspect they will offer to let you leave without working the notice, but give them the option.
And good luck. Trust your instinct. There's nothing written in stone that says you should stay at a job that's not working. You tried something different, and that's cool. It wasn't a mistake, but it might be a mistake to stay with the new job any longer than you have to.
Jim Huffman, RN