Reflux

My baby is 4 weeks old and has just started being quite unsettled after a bottle (he is formula fed). He’s also started spitting up his milk, making bubbles as though he’s teething (which he obviously isn’t), has the hiccups very frequently, gags/chokes quite a lot and he seems irritable whilst trying to burp him during a feed as he starts crying and won’t stay still.

Could this be reflux?

If so can I put him on anti reflux milk or do I need to see a doctor first?