How do you recover from the loss of your best friend?

I had a King Charles Spaniel. His name was Huntley. We were walking beside the c on monday evening when Huntley slipped on some ice and fell into the c. I tried to reach and get him out, as did a ping cyclist who leant his istance. It was no use, the c was cold and deep, the water fast flowing and the current too strong. Huntley was swept away and that is the last I saw of him. I am utterly saddened and blame myself. Will life ever be the same again?