I don't know what to do bubs is cluster feeding

My baby is 3 weeks old and is inconsolable his pediatrician the hospital and his nutritionist all said he can cry for a bit because babies cry for no reason sometimes I was scared to post this again because apparently you can't let a baby "cry it out" (yes I know you aren't supposed to) even though sometimes you just can't get them to stop so I'm waiting for those know it alls to comment on this saying "you aren't supposed to let a baby cry it out" no shit Sherlock🙄🤗

I've been trying to calm him down he's been fed, changed, given lots of love etc it's not a pain cry so I know he isn't hurting I triple checked everything and made sure he was good I just wanna know what else I can do or get him to stop I can't feed him anymore as all he does is spit it back up everytime (I've given him 4 ounces) he has yet to sleep been up for 7 hours now please help me I've given him his gas medicine also so he's good on that

I'm in a rush typing this so I can't help if it's confusing