@Runragged, a warm hello from me and welcome to Talking Point. I am sorry you have needed to find your way here, but hope you find it helpful and friendly.
Some of what you describe is exactly what I experienced with my mother. She always had good hearing, but seemed to be able to hear the quietest whisper (which was sometimes inconvenient).
She was also very, very sensitive to tone of voice, facial expression, and body language, and I mean in a scary, intense way. She had a sort of laser like focussed stare she would turn on me, and would instantly hone in on the slightest change, or on anything that was even one percent less than calm and positive and pleasant. It drove me mad and also was frightening at times, to be honest. I had to remain absolutely calm, not talk too quickly, and not show the tiniest amount of anything other than pleasant and faintly upbeat. Too upbeat, and she would be all over me. Not upbeat enough, and she was all over me. It was very hard.
She also had phases where she couldn't tolerate me moving around, notably when she was in hospital (and was very disoriented from the anesthesia, the pain meds, and the hospital induced delirium). In her hospital room, I had to sit on a particular chair placed at a precise location indicated by her, at a precise distance from her bed, and watch television and NOT MOVE A MUSCLE. If I shifted at all, or moved my attention off the TV, or breathed too loudly, she would get angry and upset. Not a fun time.
I do think all of that was her dementia, but of course cannot prove it. Some of it was possibly also anxiety. As her dementia has progressed, these things have disappeared, although non verbals, body language, tone of voice, and facial expression are still very important, because now her comprehension isn't as good and I think sometimes she can only get the nonverbal information.
I hope in some small way that is reassuring to you, just to know you're not the only one to have experienced this.
Wishing you best of luck in getting some medical help, and in general.