Jam block feeling. Or something else?

My father, (79 yrs), has been experiencing a persistent “block” or “jam” feeling between his upper abdomen and lower chest, mostly after lunch and an afternoon nap. The discomfort is not associated with chest pain, sweating, or fatigue, and it gradually subsides with time or distraction.His cardiac and respiratory evaluations — ECG, 2D Echo (EF 58%, no RWMA), Chest X-ray, BNP — are all normal. Endoscopy showed gastric erythema and erosions, RUT negative. Over the past two months, he has tried several gastric and motility medicines:Voltapraz 20, Razo-L, Omez DSR   Sucral-O, Mucaine Gel   Acogut (Lupin), Bloatpill   Ganaton (Itopride). Despite these treatments and lifestyle changes (light diet, sitting upright for 2–3 hrs post-lunch), the “block/jam” feeling continues to appear almost daily after meals.Kindly advise whether this could be due to reflux-related diaphragm pressure or something else ? (a photo with a red marked line showing the area where this discomfort happening)