Aside from certain known, universal GERD triggers (If you don't know what they are, search the internet), most people who suffer from severe GERD don't find much relief in dramatically modifying what they eat. How they eat is more effective--don't eat within 2-4 hours of bedtime, eat smaller meals (more often, rather than a large meal) to alleviate pressure on the LES valve, etc. Most people have personal triggers that cause them problems. What bothers you, might not bother me, etc. Of course, if you have a sensitivity (lactose, etc.) to a certain food, you can get symptoms that mimic reflux/GERD.
As Kitt said, PPI's inhibit the production of acid. which is helpful for most. There will be some adjustment of dosage and type of PPI to get things regulated, but most of us have found the meds to be helpful. If your LES valve weakness (and hiatus hernia) are severe enough, dit can make life unmanageable. When that has happened, some of us have sought out surgery as an answer.
Good luck in your search for help. Glad you've joined us!