I have reflux. I've had two endoscopies and two 24 hour manometry tests. I think the truth is, if you have reflux your valves, which keep stomach acid in your stomach, are weak. This could be part of the aging process or due to a predisposition.
There are a number of things that can help and are definitely worth trying. The thing that's helped me the most is stopping all alcohol. The alcohol replaxes the valves further and irritates your stomach. Chocolate has a similar effect. There are other foods worth noting, such as fried food, spicy food, raw onions, tomatoes, caffeine and fizzy drinks.
Other things to do include losing weight, eating smaller meals, eating earlier in the evening, wearing lose clothes and raising the head of your bed. Smoking is a big no no.
If you do all the things suggested, you will probably still have some reflux. Keep going back to the doctor until you are prescribed enough proton pump inhibitor to control it. Silent reflux needs a higher dose.