I know what you mean when you said it is out of the blue. It has happened to me before. I sneezed, just a small sneeze, and next thing I knew was my back hurt. After that, I was out for a month.
Just like echotpe said, we need to stay positive and we could send in our support by emailing him.
I agree...I don't know what is the real and how is he now. the only thing I can do now is wait for the 4 weeks to see the further information.
I choose to be positive about his condition since there is no use to think too much or worry too much now.
I just sent my mail to Cricketclub and i hope he can know all his fans are patient with his recovery.