What were they thinking? That is just nuts. YOu could have been seriously hurt or killed. I would definitely have words with that owner and the BO.
I think I would be fearful, too. I have never been badly bitten, and certainly not attacked in the face. just thinkiing about it gives me nightmares.
But, you want to work on . I hope that you'll recover your balance with horses. When I am out in the herd, I try not to let the horses put their heads too close to mine. I am pretty nervous about that and dont' fully trust any of them that way. Not so much that they'll really attack, but even Mac, who is such a nice guy to humans, will nibble, and sometimes put his teeth on, kindof by mistake. Not on my face, please!
I have no advice to give at all. Just wishing you a full recovery soon.