I had it early on from about weeks 6 to 10, just last week (16) it has come back with a vengence and isn't going away. Karina food triggers for me have been: pastry, grainy bread, banana, lettuce!, coconut, chocolate and they are just the ones I can think of!
Milk helps, so does ice cream. I use quick eze at the moment. My dad is a long time heartburn sufferer, he used to be on zantac, last night he told me about some wonder drug he is now on that is called Somac and he reckons he can now eat anything he wants. I do not know if it is safe for us or not, but might be worth investigating. He also suggested letting toast go cold before you eat it, apparently that helps too.