Even though I don't write, I HATE seeing reviews like that. As you stated, and as MOST of us are aware, you do have a life outside of writing. For free, I might add. Not only that, I'd rather read something with some kind of plot and plot development. This is when I think "sorry kiddo, but the writer does have to GET you there first" and that's one of the NICER things that goes through my head when seeing that.
As to your job situation, that's just awful. I've been in jobs where I hated my job, hated going to work, and in fact, got so stressed from it, my ulcer acted up in a big way. It was lovely getting sick on the train every morning before work.
As to the lack of children, I've observed over time that people can be insensitive about it. Many suffer from "open mouth insert foot" syndrome regarding this as well. As you've said, there are medical reasons for this having happened for you. The point is, whether or not a person knows why you don't have any children, doesn't mean that a person should badger you about HAVING children. Gal I've been friends with since I was 10, has never had any. She's never had a desire to be a mother. She got a load of crap from many people over the years about it, but it works for her. Thing to remember here is that it's no one else's business, and they keep sticking noses and comments in where not wanted, you're well within your rights to tell 'em to shut the fuck up and leave it alone.
As to your cousin? He needs some serious help.