I'm so sorry to hear about all those painful conditions that you both have. I had one episode of TN several years ago as a result of an MS exacerbation, and I too was left with a Bell's Palsy.
I was lucky enugh for both of them to pass without any lasting problems, and I hope that you too finally get relief from your symptoms.
I've not heard of the condition known as hypercausis before, but I do have overly sensitive hearing which I blame on MS. Any loud noises cause me severe ear pain; even the ads on TV which are always louder than the program that I've been watching, cause me pain.
Good luck to both of you in getting relief from what ever works for you. I look forward to soon reading that your pains have passed.
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