I have been having pain pretty much constant for 3 days. Its a Tight Burning Pain on left side of chest and sometimes my left arm goes sore too. The burning pain is horrible as it flares up randomly during the day. I have also left chest tightness too which causes soreness and discomfort. I went to the doctor and he said it was muscular and gave me voltaren rapid but it didn't work and gave me the horrible side effect of sadness. What could this be? I don't suffer from anxiety or reflux/heartburn/gerd? so I am at a loss. =( HALP! All feedback appreciated.