In search of a remedy for Gastrointestinal Disorder for my 21 year old son, who suffers tummy cramps after eating…

In search of a remedy for Gastrointestinal Disorder for my 21 year old son, who suffers tummy cramps after eating, nausea, and heart burns. I have taken him to the doctor who after running tests advised that he take any over the counter drug such as Pepto, Tums, Zantac etc… It’s over a month and [...]