Are these probably GERD-related?

I've had reflux issues in the past. Sometimes I'll have a period of a week or two where my stomach is just very acidic and prone to heartburn and nausea, and I can't eat anything too rich or it will make it way worse. I'll sometimes wake up from sleep feeling acid backing up into my throat. Ew. But it's never been all that bad, and I've never really needed meds because it goes away on its own pretty fast (and the meds I have tried either barely worked or had nasty side effects.)

Well lately I've been having a few symptoms that worry me, as they can be common with other GI issues that are more serious. They include:

- Nausea
- Painless regurgitation of food (not all the way, but I can feel it in the back of my throat)
- Pinching pains around my stomach area, often after meals
- Nausea whenever I'm hungry
- Loss of appetite
- Belching, often with a nasty taste (kind of like whatever I've just eaten, but kinda rancid)
- Frequent and sometimes severe pain beneath my left shoulder blade or between my shoulder blades (possibly trapped gas - went away after burping once)

So could these be caused by GERD? I've had my gallbladder checked recently in a PIPIDA scan. Normal. Liver and pancreatic enzymes are normal. I don't know what else could be wrong. I've heard ulcers can cause these kinds of symptoms. What would you recommend I do? It's been about a week since these symptoms started.