If your Domain is Registered through GoDaddy and uses GoDaddy Name Servers there is a good chance it is unreachable at this time, which is an issue with GoDaddy and not your host provider.
Glad to hear it has returned to normal and thanks for the update.
Just for perspective Gavin wrote into the Service Desk yesterday as he was experiencing slowness in pages loading and it appears that one or more elements of his site were being called from GoDaddy related sites.