Reflux or something more??? Please help

[Pman817]

Over the last two years are so I have dealt with reflux and constant burping on and off depending on my diet. Have seen a GI doctor before and they felt like it was GERD and gave me Protnix which I took and felt better other than the fact that the burping never went away.. About a week ago I got a severe pain in the middle of my stomach just below my ribs.. I was sick all night and and threw up and had diaherra.. since then I have been fine but have had this consant squeezing pain in the same area of the stomach although not near as bad as last week and I no longer have any throwing up or diaherra. could this just be a bad reflux flare up or could it be more serious like stomach cancer.. I am worried that I have had stomach cancer these last two years and not actually GERD