My 5 month old is having metallic smelling stools and farts. He is very gassy with a constantly gurgley belly. Suddenly isn't tolerating foods he has been eating for months and is vomiting 2 hours after eating. He is crying inconsolably all the time and doesn't sleep well. His doctor says it's just reflux but he has been on many different medications and none are working. Should I seek a second opinion or take my doctors word for it?