Do you drink too much liquid with your meals? Do you drink carbonated drinks, especially a no-no. I sleep on my left side and don't go to bed at least 3 hours after a meal. I watch what I eat, cut down on fats and eat more grains, vegetables,etc.
Do you bend over after meals?
I know that from taking antacids in the past, it makes the problem worse later on. It's called acid-rebound. How long have you been taking gaviscon? I quit taking any antacids or PPI and take herbal supplements and watch my diet. So far I've been fine.