This is different than I thought

My baby got released from the nicu yesterday morning and OH MYYYY our night was so bad😭 he wouldn’t stop crying and he woke up every hour crying. We got no sleep. I changed him, and tried rocking him to sleep, put music and nothing worked. I had fed him around 2am something and he left a little bit and by 3:40am he wanted more. Then he kept wanting more and more. Finally around 5am something he fell asleep after eating more then 6:30am rolls around and he wanted a full bottle. Now he’s asleep with a full stomach. Am I going to have trouble with him at night?! Can he be not used to leaving the nicu? He was there for 3 weeks. Is he actually hungry even tho I fed him almost every hour? He was so calm and quiet in the nicu and bam now he’s completely different