Sad to hear, especially if it is what you love to do. Everyone goes through hard points in their life.
I had a really good boss that one day delivered some really bad news, we talked for an hour or two. Of course I remember it cause it was a bad day, but the last thing he told me has always stuck with me...
"Its not what happens to you, it how you react to it"
Yes you will be bummed for a while. But dont go into depression dwelling on the past, make your future what you want it. Who knows, you may find something else that is just as gratifying as cattle were. Keep an open mind.
Per your header... Maybe its the end of a dream, but the start of a second one.
My two cents,