The other option you have, and it may be the best (it's fastest), is that if you get there and he's in the same shape your husband found him in, call 911 for an ambulance. He's clearly very weak and need medical attention.

I won't go into the whole story but my estranged father had a stroke and laid in his own urine for up to 3 days before anyone noticed. He was mentally ill and had just told the neighbors to leave him alone. He did this from time to time and then he'd turn around and be friendly again. So they just assumed he was doing the same thing until the 3rd day that nobody had seen him. He was in pretty bad shape when they found him. Believe me, you don't want to have that happen. I hadn't seen him in 20 years and I still felt guilty.

I'm sorry you are going through this. I know it's really hard.