Strange Pain Lower Back-lower Right Shoulder

I have this coming and going pain below my right shoulder blade, sometimes it seems to travel down my right side. Not a consistent paid but more a discomfort. At times I thought it might be a build up of "gas" as that seems to relieve the problem. Other symptoms I note at times is if I go to sleep with this discomfort, when I wake in the morning I feel a bit nauseated. When this began the pain grew to the point that I had become extremely sick and was hospitalized. My gall bladder was removed and for about a year I did not have this discomfort, now it has resurfaced. Not sure if it is a gas, acid issue, any insight is greatly appreciated.