Rain, as others have said, don't beat yourself up over the loss of your babies, and certainly don't blame yourself! You had smarts enough to come here and ask for help. Had you done nothing at all, then I would say yes, kick yourself and kick yourself real hard! But the fact that you have been trying so hard to save every single one of them speaks volumes about your integrity as a chicken momma!
It's true: We really do all make mistakes. The difference is in whether you learn from those mistakes or not. You obviously have! So, please, stop beating yourself up over it.
Now, run along and enjoy the chicks that you do have, and always remember: Here at BYC, you have people who care, and people who usually know what to do, and joyfully, they're all wrapped up in the same people!
Oh, and when you get a moment, post some pics of your little goobers! We always love to see the babies!!