Sudden rough sleep—help!

My little guy is 13-14 weeks and has always seemed for be a fairly good sleeper, he was even improving. Only waking to eat 1-2 times a night. Then suddenly about a week ago he became really fussy and only sleeps about 1-2ish hours at a time and wakes just about up every time I try to lay him back down. He will wake up about 30-45 minutes after I put him down for bed and it’ll take an hour or so to get him calm or even down again completely. Since we were already low on night feedings I didn’t want to get him used to nursing back to sleep so Ive been only feeding him if 3hours have went by or if I can’t get him calm and notice it’s been about 2.5 hours. And all this is the Same sleep for his naps but I can usually get him back to sleep easier then he will wake up at the 1.5hour mark again. He used to be able to nap a solid 2 hours. I thought maybe it was a leap or growth spurt but we’re going on a week+ here. Is this normal?? How do I help him? How do we get through this? This FTM mama is TIRED.