I've been around people for nearly 50 years and spent the first 5-6 years of my career doing phone support for a laptop firm and then some fairly advanced text translation software for EDI. I know exactly what you're describing, I've done it many times myself.
Please just trust me when I say that's not it. I could be wrong in my assessment, sure, but they are definitely not thinking about how to incorporate anything I suggest into treatment. It's pure 'get this guy to shut up'.
Thank you for the kind wishes.
That being said I think you're making a huge unfounded leap in interpreting their responses. What you're describing sounds like me on a customer support call when presented with evidence that my diagnosis of a software issue was wrong. My mind races, goes back to first principles (small words), I sit up and dial up my professionalism. I also can't help but wonder as to the reliability of the customer. I'm the expert in my software! Who's more likely to be wrong?
It's a tough situation in software, I literally cannot imagine what it's like when someone's life is on the line.
Best wishes, and I hope you get the best medical care possible.