Suggest Treatment For GERD In The Child

Hi. My son is 20 months old. Since the age of 6 months, we realized that he has GERD. He puked on every sour taste of food. But, as he grew older, we have been noticing that he pukes on any new food or medicine given to him. He pukes the moment a new medicine is put in his mouth whose taste he cannot recognize. He can only have tasteless medicines like Enterogermina which we had given him the last time he had a bout of diarrhea and vomitting at 15 months. As days go by, he doesn t even have the medicines he used to have for cough and cold. We have given him febrex plus, zefs syrup and sitopaladi churna during his last cold and cough spell. But, this time around, even that doesn t go inside him. I tried giving him these medicines for 3 days at the cost of continuous puking and nausea feeling only to lose his weight by 900 gms. Vs. His last month weight. Today, when I stopped giving all the medicines, he was perfectly fine with no vomit or nausea... but cold and cough remaining at its place. His doctor says dont let him eat... dont force feed or that he is stubborn and therefore he rejects medicines. But as his mother, I realize the reason which his doctor isnt ready to accept or even understand. What should I do? Is there any doctor who can understand my son and his problem? Please help me.