Hi James, I am not a doctor nor a nurse, but I have suffered from the symptoms you are describing. I was checked up by my General practitioner and I suffer from mild functional dyspepsia. Here are some pieces of advice I got and frankly, most of them have worked.
Try drinking sparkling mineral water with your meals. The carbon dioxide will help you burp.
Add fresh ginger to herbs infusions after meals.
Avoid any raw nut drink, like soja milk, and raw fruits in the morning. It can add to the discomfort because it will "irritate" the gallblader.
Avoid foods that have a high acidic content, like tomatoes (trust me, I found this the hard way).
Avoid eating slouching and go for a walk. Both are great to prevent indigestion.
I hope this can help. I'd advise you to still seek medical advise.