Welcome to Over50sForum! The site for people over 50 to chat, make friends, discuss, share, and generally be part of something that's fun and friendly :)
I think I remember you saying that you had some good neighbours, so how about ringing them to say hello and to ask how they are, they are sure then to ask you the same thing...
I agree, let your neighbours know. I would hate to think of my neighbour being very unwell and perhaps looking for a chat or some help, but not saying anything. Get better soon