I agree bizarre post but since it has come up in my latest I thought I might check how your DH is doing?
I had an ABI when I was 10 when i had a bad fall head first onto concrete. I too struggled with sounds closer than they were and also lost my sense of taste.
Between 9 months and a year it started coming back and after 14 months was back to normal like it never happened.
I hope the same goes for your hubby.