Discomfort under left rib cage....?

For the past few days i been feeling more and more congested. Its mostly feeling it in my throat. Which i been having for awhile now. But tonight i been having major issues. Throughout the day i would get a sharp pain in the left side of my chest.....it would come and go and didn't last very long at all. Then as I'm sitting down i start to get this discomfort right under the lower left side of my rib cage. It felt like pressure. My wife says it was gas but it had me worried cause i know around that area is you lungs. My question is, with the weather change from going hot to cold. Could i have a bad cold, pneumonia. I do have a history of bad reflux. I mean to me it could be any of them three. All i know is after i felt that pressure i started to cough a lot and started to cough up Phlegm it wasn't a yellow color or green. After awhile coughed so much i started to have a acid taste in my throat. But my reflux has never caused discomfort under my rib cage like that before. So i guess I'm just asking for people opinions cause I'm really worried. Could it be a combo of both reflux and being sick. Or can reflux really do that to you. Any help on the matter would be appreciated.