Consult with your doctor, but both camomile tea and DGL (licorice) tablets (available in health food stores and online) should begin to help some. Frequent gum chewing
and sucking on a lossage will help also, since saliva includes
bicarbonate, which is an effective natural antacid.
As for the pain in the neck/shoulder, that I can't say, but burning and tingling may be indications of a pinched or inflamed nerve, and it's not likely related to acid reflux.