about a month or so ago, I start experiencing unusual rumbling sound in my lower left abdomen and I was burping 8 to 12 hours after a meal. recently and about couple of weeks ago, I start experiencing a pain in my middle and upper back and finally and about a week ago, I start having sharp pain in my upper abdomen and upper right back area where i believe the liver is. I suspect it may be my gallbladder. I don t feel nauseate and no vomiting, just the pain under my right shoulder. If it is not the gallbladder, what could it be?