As like everyone on here said.. I'm sorry about what you are going thru.. and I can RELATE IMMENSELY. But I want you to know there is HOPE and give your body TIME to adjust. TIME is a big major factor here as well.
I had my surgery on Feb. 15th. I too had the same expereience of dry heaving, throwing up foam, barely can breath, the feeling of being intoxicated but you have no control, scared to eat or drink anything. the burning acidic feeling.. Everything you explained I went thru during the first month after surgery. I even went thru Depression.. wondering if this was the right thing I did? And YES for me.. it IS.
BUT.. I learned aside from my sleeve acting up.. it was all in me. I started reading my binder again. (Kaiser patients receive a VSG bible prior before surgery to prepare yourself)
My conclusion? This is a life style change. I wasn't sipping my water like I should. I was drinking like I normally do. The food I was consuming was either too fatty, oily, sugary.. and of course this was is a BIG NO NO.. So I readjusted. I started eating SLOWER. Making sure I take 30 bites or more and also Sipping slowly helped me BIG TIME. After eating any meal I MAKE MYSELF either walk or stand because it helps me digest better for some reason.
I hope this helps.. I know it sounds really like basic. BUT in reality by mastering eating slowly and sipping on your drink really reduces those symptoms you're going thru.. also.. I think because you just recently had surgery.. your body is still re-adjusting.Take time, watch yourself and how you might be consuming your drink and food intake. Give yourself TIME..it will workout. I hope this helps.