Thanks 109786 - I think those are some interesting suggestions you provide. Will definitely try them. I don't think I overeat. I do think I eat fast though. I always say I am going to remind myself to chew properly when next I eat and I seem to forget!
But I honestly didn't know that eating too much could be a factor in this situation.
I am taking enzymes with HCL. It's actually a multi-enzyme, "maximum strength" formula that seems to help. It contains Pancreatin (Amylase, Protease, Lipase), Betaine Hydrochloride, Pepsin, Bromelain (from pineapple), and Papain (from papaya). Are there more comprehensive ones that are reasonably priced?