@car0717 I’m so sorry this has happened to your dad. It’s especially hard to deal with when it is your Dad or Mom. You said he rightsided droopiness, swallowing problems, and voice problems, but you haven’t said how old he is. Has he seen the neurologist and gastroenterologist, to help evaluate what’s going on. Has anyone mentioned a speech therapist—they can help figure out speech and swallowing problems. When i fist got my autoimmune illness and i was in rehabilitation, I had a speech therapist at all my meals. She was excellent!
https://connect.mayoclinic.org/group/neuropathy/. Have you looked at the Neuropathy Support Groups. That also have a lot of information.
Will you keep me posted as you learn more about your dad?