2 month old sleep regression, congestion

My son was doing really well with his sleeping patterns. We’ve followed a schedule since he was 2 weeks old. He eventually started sleeping 4-5 hour stretches around 5-6 weeks old. Now all of a sudden he’s up within two hours after being put down and then every 30 minutes to an hour ALL NIGHT. It’s so frustrating and I’m exhausted. This has been going on for 3 nights now.

He’s also got some congestion and I’ve used saline drops and the bulb to suck everything out but it keeps coming back. Could that be why he’s sleeping so bad now? Or is there a sleep regression around this time?

Any advice welcome. I just want my sleep and sanity back 😩