(Friendly) Advice Please

Someone posted yesterday of a situation very similar to mine. My 4 week old is NOT sleeping well. He will sleep 1-2 hours in bassinet and start grunting like crazy, very intensely and then screaming. I change him, nurse him, burp, keen upright, etc, put him down. Same thing 1-2 hours and repeat. Once we hit about 3am that’s it, he will NOT sleep. He grunts so loudly. I’ve tried letting him grunt it out but he doesn’t stop and me and hubby don’t get sleep. I got so desperate, I laid him with me, and what do you know- sound asleep for 3-4 hours until I wake him up to nurse.

We’ve tried swaddling, different things to sleep in, different clothing, I even tried to dockatot with him swaddled in the bed. Nothing works. He literally only stops when he’s right next to me on the bed!

I swore I’d never do this but we are all desperate for sleep! I’m at a loss. What do I do!?