At first it was complete shock. The next few days were complete confusion and sadness. However, I think one thing you learn pretty quickly is that acceptance is the only path forward, and that if you don't accept early, you will only get worse. I'm really grateful that I've had many, many years of therapy prior to this, so that I at least can identify the tools to bring me back out of the grief.
I would say that I'm somewhat stable now. I don't necessarily fear what might happen in the future, although grim. Have my feelings changed? Not necessarily, but they don't affect me in the same way they used to. I let them be there, however I do not attempt to push them away or let them consume me. A few days prior I would struggle to wake up in the morning, however after going through therapy I can usually wake up early.
If anyone is struggling, I would recommend a book called "The Happiness Trap" it's been instrumental in getting my mind back on track.