Hi, Angela ~
I'm so sorry that your husband's AN surgery was so stressful for you but this is not entirely unusual with this kind of tumor. As my neurosurgeon stated: "it's not the tumor (which is benign),"it's the location that makes the operation difficult". It's very likely that 16 hours under relatively strong anesthesia is the cause of Scott's severe discomfort. That should abate as the drugs pass out of his body. However, he may still have some discomfort for awhile. Hopefully, not long.
We often say here that the AN surgery patient has it 'easy' because they're asleep the whole time while loved ones agonize while waiting. You apparently had a very scary time of it and the hospital could have been more helpful with communicating what was happening. However, it's done and now the healing begins. I trust that Scott will be better today and can begin to recover. He'll need your support and you'll both need patience. Eventually, life returns to (relative) normal. I state this from experience.
Meanwhile, please avail yourself of the information and support the ANA discussion forums offer - and when he's able, suggest that Scott register and post, also. We would like to welcome him. Meanwhile, please try to take care of yourself and know that 'there is life after an acoustic neuroma'.
Jim