It is true that the symptoms are most likely due to gastritis due to acid reflux from the stomach but a gall bladder disease also cannot be ruled out.
Try raising the head of your bed about four inches with
blocks. It also might help
to avoid eating or drinking for two hours before you lie down. To help
control the stomach acid, one should not drink alcohol or drinks with
caffeine in them, or eat chocolate or spicy or greasy foods .
Take some OTC antacid like Mylanta.