What would you do? Cry not cry

Babs ( 15 days old ) is very fussy last couple of days, where he first would drink, be full and then go to sleep - he now wants to be drinking non stop and gives alot of milk back even after burping and keeping him up for 30 minutes so everything can settle.

I think he might be drinking too much since he gives way more back then usual - also the last feed turned into 3 hours of then drinking - settle stomach - giving milk back.

As soon as I put him in bed its only big cries and yesterday he slept 7 hours out of 24.. seems like today is going to be the same.

What are opinions about letting babs cry in bed? Apparently it's normal for him to throw up a bit more if he drinks too much and I can't have him 24/7 sleeping and drinking on my chest