You're not alone here Leash... my dp barely even wakes when ds starts screaming. In the beginning (yep, the first three weeks or so) he was great, would change a nappy and even do a bottle of ebm, but not anymore. Every now and the he'll get the guilts and get up but doesn't have the knack of settling him (or the boobs to settle him with for that matter).
Sorry not much help but here's a . It's still early days for you- another few weeks and the fog will start to lift... you might still be getting up at night but you won't feel so much like a zombie. Hang on in there.