Hey Lela,
Of course you want a break from the anxiety. And you absolutely deserve one (and a very very long one at that!). And I completely agree that you should take time for yourself to recover - you went through a hell of a lot and anyone in your shoes would be be mentally and emotionally drained from the experience.
Sounds like your DP's views are a bit entrenched. It wouldn't do it any harm now to investigate, would it? And unless his parents live in the Shetland Islands, there must be somewhere where they are within a shortish drive and you'd be able to make new friends? Not that you need to even think about it yourself now, but if he wants to talk about it he needs to find a constructive way of dealing with it - ideally behind the scenes without pestering you.
I bet your DP loves coming home to you and your DS. What he said about looking forward to living in the countryside was insensitive though. He's a bit of a twazzock for that but I don't think you should equate that with him not looking forward to being with you and his new baby and please please don't take the leap to thinking that you don't deserve that. What I think he might mean is that, however wonderful you and your DS are, it doesn't remove the fact that he's had a crappy day at work, he was stuck in an air-conditioned box, the tube was smelly and disgusting, and he thinks that living in the countryside would make those bits of his life better.
I know what you mean though. For me - and I didn't suffer like you - going through the pregnancy, birth and the first few weeks was such a huge deal, I felt sort of cheated when DH's life plodded along as normal and he'd come home and moan about work. I wanted him to be proud and happy the whole time, it was part of my vision of life with a baby. And then he got depression and I thought, hand on, that wasn't the deal. I'm doing the hard stuff and the least you can do is walk round with a permanent grin on your face like new dads are supposed to. Sorry, can't put it into words exactly. I was disappointed though.
But I can say that as I got used to being at home and the newness and scariness wore off, we struck a balance and for both of us now I know that life carries on but we've got this little creature who makes life much, much better but can't solve everything. I think partly that it's a hormonal discrepancy between men and women - I felt love for my DS but pretty much every other emotion so keenly after birth but DH's world view was rather less intense, a bit too rational for my liking. A year later (even a few weeks later) the hormones have gone, as has his depression, and we are singing from the same hymn sheet.
Rambling now. Anyhow, I'm sure that he loves you both an enormous amount but it sounds as though he's got a classic dose of male insensitivity. Give him a kick, but don't take it to heart sweetheart.