Re: I'm new and exhausted...
You may want him to write a living will or health proxy to you as POA for medical reason.
This way, you can decide for him what to do when he needs the nursing home and etc. He will also write down the directive so you know if he wants artificial tubes or that kind of stuff (tube feeding and etc.)
The POA for finances is a must as well. You need both kinds of POA.
Sorry that your husband has AD.
My FIL has severe stage of regular onset AD - he is 91.