Chill, the exact same thing happened to me--I submitted about 1am, and got the credit card confirmation screen, but no confirmation screen or email that i actually successfully admitted. I was thinking that it was, like, the biggest let down EVER--but i just called VMCAS and they said that sometimes the emails don't go out, etc, but that if we got the credit card confirmation, then the applications was definitely submitted. You can also log back into your application and make sure that the e-submit button has disappeared.
I feel kind of cheated cause i tossed and turned all night thinking really? that's it? you couldn't even congratulate me?
Let me know if you hear anything different!