It sounds as though your hit did not do a lot of damage. As others have said, it was probably a flesh wound. Deer are pretty tough, and aren't so easy to kill. My brother in law killed a doe last year during gun season and when he field dressed her, we found a broadhead in her shoulder!! I know it is a sickening feeling you have right now; trust me, I know from experience. If I had to make a guess on what will happen to the deer, I would say he will survive and you may even get another chance at him. My advice to you would be to get back in the saddle and get back in the woods as soon as you can!!!