Help! Nap schedule thrown off :(

I’m wondering if anyone else is following an eat/play/sleep schedule with their baby and if so what do you do to recover when it gets thrown off? My son is 8 weeks and we just started today and it was going SO well until around lunchtime we got a surprise visitor and my dog barked and woke up my son and I couldn’t get him back to sleep and now he just keeps alternating between eating and falling asleep on my boob every 5 minutes. I try to dim the lights and put him down to sleep and he screams, I turn on the lights and open the blinds and change him to try to keep him up long enough to nurse for a bit and he falls asleep... I’m so frustrated and exhausted and it’s been 4 hours now and I can’t seem to get him to come back from it. It’s such a dysfunctional exhausting pattern.