I’m shattered emotionally....

I'd say the dog needs to be put down. Our neighbors had pit bulls, and they got loose and almost killed our coon hound. Ripped one ear off, damaged several muscles in her legs, then went after my Mom. Thankfully they didn't get her, and our dog recovered. Owner paid the vet bill, and told my Dad to shoot them if they ever got loose again. He was a super nice guy and the dogs were his son's, but he took responsibility and never let it happen again. My parents have owned 2 dogs that bit, but they made sure not to let them near anybody new, nor did they run around off a leash. Extra precautions need to be taken with animals like this. I hate to hear about your troubles though. Hopefully everything will work out.