Here is a whole page of tips for your husband. My husband has had this for years, and one thing that sets it off is rocking in a rocking chair after eating. Doctors never ask about rocking habits, LOL.
http://www.****.***
This page is on medications for GERD (gastroesophageal reflux disease is another name for heartburn).
http://www.****.***
its most likely heart burn. go pick up some heart burn medicine at the pharmacy..try it and see if that s works...