Do I have GERD Acid Reflux?

When I eat I feel fine but then 30 minutes later I feel the food going up to my esophagus and it stays there then goes away like an hour later. I am 18 years old. I also get chest pains and tight chest at times. I also get nausea. Could this be GERD? (Gastroesophageal reflux disease). It sucks so much :(. I went to the doctors and they told me my voice box is red and swollen and gave me some pills but they dont seem to work. Someone please help!? thanks.