Question about GERD/Acid reflux disease?

I have been suffering from this for years. I have been to the doctors and have been prescribed omeprazole time after time. I have tried different types of omeprazole and still have symptoms. I get chest tightness and stomach is always upset. I have had several ekgs done and its always been normal. Does anyone have any suggestions? I am tired of suffering from this and it seems to get worse and worse. I have constant burping, heartburn and sometimes I get dizziness along with it.