i am being treated for GERD as well for past over two months. I apparently have 'silent GERD' which means, i do not have any symptoms of Acid Reflux (e.g. cough, heartburn etc.) however, i do have bunch of other symptoms like left arm pain, tinlging, weakness etc.
All the doctors i have seen (Cardiologist, 2 PCPs, 2 GIs) have told me it is related to anxiety. Eventhough no doctor has admitted any proof of relation between GERD and anxiety, but looking at internet, there are way too many people out there who have left arm symptoms while having GERD.
my 2 cents, Kitt might be right on Calcium... i am just disapoointed to note how under-researched is the field of GERD.