tracking symptoms

Hi.. I have been keeping a record of what I am eating to determine what may cause symptoms. My question is how soon do you get heartburn after eating so you know what caused it. For example I ate spaghetti with red sauce at 6pm for dinner to see if it caused symptoms for me. I was fine all night, no burn. The next morning I had an activia yogurt for breakfast as I always do with no symptoms and around 9 am had bad chest pains and burning. Could this be from the red sauce the night before? I am having trouble trying to relate the cause of my symptoms because they don't occur right after a meal. Any ideas?? I am taking Protonix every am and a zantac at night and have added the dgl licorice before meals and at bedtime

Thanks I will try to avoid these foods I guess. It is so frustrating because one day I eat something and feel fine, and another day it will bother me. I do believe the licorice is helping tho. I have been using it for about 3 weeks and have noticed improvement. Maybe soon I will be able to go off the zantac. Do you know of any books with recipes for heartburn sufferers?