I always get this pretty painful and distracting discomfort whenever I drink water and when I sometimes eat, for example I'll feel:

Sharp pain on the right side of my back, pain when sometimes swallowing non-soft foods (I can almost feel it going down my chest) same thing happens with water, discomfort around my stomach area, a knot feeling around my chest especially when I'm sitting or laying down, drinking water will also cause a brief moment of breathlessness (also causes shortness of breath when laying down), uncomfortable bloating, lots of belching during and after meals.

Any idea on what all this could mean? I'm very slim and physically active, It's making me scared.