Another mum of a crappy sleeper here
Glad to have read through this and found a bit of good news. Well done on getting out to your MG, hope you can connnect with some of the other mummies there. And REALLY good news on resettling bubs.
The hug-a-bub got us through our hell in the early days.... and once he slept (at all) during the day, we found his night sleep improved also. We've had good and bad periods with sleep, but he still sleeps very little. Don't mean to sound disheartening, was just going to second the poster who said your body adapts and you cope.
All the best to you