Acid Reflux or Motility Issue?

Has anyone experienced a sensation of a burp or lump stuck in the back of the throat, which can sometimes also be felt in the diaphragm, either at the same time or separately? It tends to be worse after eating and comes and goes. Burping doesn’t seem to relieve it. I’m trying to figure out if this is just acid reflux or something more like a motility issue where food isn’t going down properly. It started about two months ago with pressure in my diaphragm and has gradually moved up to my throat. The pressure in my diaphragm isn’t as intense as it used to be, but it still occurs occasionally, especially after meals. My diet has been very bland during this time, and while I can eat more than I could initially, I still experience occasional heartburn. However, this sensation feels different—more like a lump in my throat or pressure in my diaphragm, similar to a trapped burp. I also deal with a lot of phlegm and ear pressure when I feel the lump in my throat. I’m just trying to rule out anything more serious than acid reflux so I don’t end up taking a PPI unnecessarily.