HV, it is confusing for me as well. First-almost instantly I get like a burning sensation in the middle of esophagus

Still not clear on what are referring to as the middle of the esophagus.  But based on what you say below though it sounds like a hiatal hernia leading to acid reflux.

and then I start getting burps and the burps seem to be coming from the throat area and I can't swallow. Seeping water with apple cider vinegar also becomes very difficult. I have to get up, walk around and the moment this continuing burps subside I take a seep and then things begin to quiet down.
It seems as if the whole area from middle of the esophagus to the throat is involved.(all this happens when I put something sour in my mouth-otherwise every thing is OK)

I really welcome your comments.

Again when you say "middle of the esophagus" do you mean at the bottom the sternum (breast bone)?