10 weeek old changed? Please help moms!!!!

M • *DD 5-19-08*DS 7-15-16 lost @5m pg*🌈 baby DS 7-30-17* Baby #4 On The Way 10-08-19

My son is going to be 10 weeks old in 2 days. All of a sudden the last few days he’s changed completely he used to be sooo happy and never cried (unless hungry or tired) now he’s crying non stop, soo fussy, won’t sleep unless someone holds him, if you put him down he freaks out and lets out the most heartbreaking cry. I haven’t slept in 4 days! He won’t sleep longer than a hr if that at night and sleeps during the day 10-15 mins at a time the second you put him down he wakes up screaming. He used to sleep from 9:30-3:30am then again sleep till 6:45am and wake up again at 8:30 to start our day but I don’t know what is going on with him. His eating habits changed he eats non stop I am exclusively breastfeeding he won’t stop eating and still doesn’t seem to be content or happy. Please any moms out there with any advice or help or went through this? I’m so tired and I feel horrible I can’t make him feel better :( I thought maybe teething? Please help!