Yes, sons (and daughters) can be brutally honest, can't they? I do agree with others, though, that your son was only telling you the truth. My own son and his family are nearby but we rarely see them now the children are teenagers. I don't mind, they have their own lives to lead as do we, and I know he would help out if it became necessary. IMHO downsizing in your own locality is probably the best solution. It is probably a daunting prospect on your own so it would be good if your son or a friend or another relative could lend a hand. I wonder if Age Concern have any advice to offer? You could try looking at their website or giving them a call. Good luck with whatever you decide. 
Hosepipe ban, why is this not nationwide?
Govt announces Ukrainian style scheme to bring thousands more migrants to UK
If you had the chance to be the Roosevelt of our time what jobs would you provide?
