A couple of days ago he stopped talking to me and says I am the cause. He still drives and if I ask him to take me to Drs for appt. He says “all I am is your chauffeur. I do not know what I did to cause his behavior. He will not eat anything I offer him. He seems to hate me!
If your husband doesn't respond to your questions about what is upsetting him, how about just stating the facts. Say something like "I can see you are upset and angry. I would love to help put things right."
It could be simply a phase of the dementia on its own; but if it were I'm not sure you'd have got the chauffeuring complaint. Bear in mind that he can be angry in general, and upset in general, without its being anything you have done or, sadly, can help.
This anger may pass as suddenly as it came on. Or not. Sigh.
Early onset ALZ is when the dementia starts before age 65. Is that what you meant? Or did you mean early stage dementia -- near the beginning?
He may have a UTI. He may be going through a paranoid stage. There are meds that can be prescrbed for his agitated behavior.