Can you have frequent heartburn without actually having gerd?

I HAVE FREQUENT HEARTBURN AT LEAST TWICE A DAY BUT NO ACID REFLUX. i NORMALLY DONT EAT SPICY FOODS SO IM NOT EXACTLY SURE WHAT IT COULD BE. IVE TRIED ZANTAC, ROLAIDS, TARGAMENT(I THINK THATS WHAT ITS CALLED). ANY CLUE WHAT I MAY BE GONG THROUGH?????(NOTICE HOW THE LAST SENTENCE RHYMES?LOL)