Your GP should be able to tell you if you have a hiatus hernia, which is 'common' in ladies of a certain age. Eating little and often might help. Avoiding greasy/spicy foods for a while ……. using Colpermin capsules within the hour of eating your main meals …….. LIVE yoghurt can ease symptoms.
Good old Milk of Magnesia liquid helps. Propping up your pillows at night or raising the bottom of the bed.