Stop BOTH meds. Give just breastfeeds at a gap of atleast 2-1/2 to 3 hours,nothing else by mouth,don't wake him up for a feed,burp him for atleast 10 mins after every feed,lay him down on his RIGHT side after burping and keep the baby elevated by placing a cushion beneath the head and shoulders,24 hours. If not improving,go in for ultrasound to rule out hypertrophic pyloric stenosis,ask your paediatrician about this.