1 Year child vomiting for 4 days?

ON FRIDAY NIGHT WE NOTICE 4 MARBLES IN MY SONS DIAPER, THAT HE ATE AND PED. THAT NIGHT WHILE I WAS FEEDING HIM, HE ACTED LIKE HE WAS CHOKING AND VOMITED. THE NEXT MORNING WE NOTICED THAT HE VOMITED IN HIS CRIB. SATURDAY WE WENT OUT TO EAT AND AGAIN WHILE FEEDING HIM HE ACTED AS IF HE WAS CHOKING AND HE VOMITED. ON SUNDAY I FED HIM LIGHTLY A GERBER AND HE AGAIN VOMITED. SO I TOOK HIM TO THE EMERGENCY ROOM AND THEY DID X-RAYS, SAID ALL WAS OK AND THAT HE HAD AN EAR INFECTION. HE WENT ALL DAY FINE ON MONDAY, HE ATE A GEBER AND CHICKEN SOUP AND DID FINE. THEN AT NIGHT HE GOT A SMALL MARSHMALLOW AND COUGHED AND BEGAN THROWING UP. I AM REALLY SCARED AND THINKING CRAZY THINGS. SOME ONE PLEASE LET ME KNOW WHAT YOU THINK.