Welcome to the forum Neeks and Sweet.
Neeks, since you have noticed a connection between GERD from certain foods, it would be helpful to keep a really good food journal. There are loads of old threads and posts about this you can look up in the search box at the top of the page.
Basically, just write in a smallish notebook with a page for each day, the time, what you eat drink, meds and any reactions. My allergist had me do this and it helped us find out that I have specific food intolerances, which she lumps with allergies. My symptoms are a bubble feeling in my stomach followed by heart arrhythmias, usually tachycardia. Burping often stops the spasms. Some people are helped by starting with a bland diet. I don't have to eat bland food, just avoid the ones containing my particular allergen (sulfite). Other people can have other triggers!
Burping is sort of a Valsalva maneuver, which you can google also. When I get a long run of arrhythmia my cardiologist has me take an Inderal, which works very quickly and usually helps stop the reaction.
Since the stomach, trachea, esophagus and heart and more are all connected by the vagus nerve, it's not surprising that a problem with one organ can cause a reaction in another. Names for this are: cardio-esophogeal reflex or linked angina. There are loads of research papers online now for you to read. I've even had abscesses on my intestines cause tachycardia.
It's always best to see a qualified doctor for serious problems, and I'm glad you are doing this. We posters can only tell our personal experiences. We're just patients!