Baby won’t sleep all the sudden

My baby is 9 weeks and 2 days and for the past 1-2 weeks he just has taken a major step back in terms of sleep. He hardly sleeps at night anymore. Does one first stretch at 2.5 hours and wakes up every hour after that and cries like mad. Used to do 3-4 hours then only wake up to feed and back to sleep until 6am with little crying. I also have to rock him and hold him and I never needed to do this previously at night (only for naps). I’m going mad. It’s like having a newborn days back! Anyone else experienced this?