I have Gerd, and IBS.. have had it for years and years. Most of the time, the prilosec manages the Acid reflux. My IBS acts up often but if I watch what I eat, its manageable. The past few months off and on, I get a rumbly stomach, and very gassy at times. But what concerns me is the off and on pain on the upper right side and left side too.. almost under my breastbone, but seems to be upper stomach? Its sharp but doesn't stay all day... off and on... could this be from my meals and the acid reflux?