Hi My Name Is Tiffany And I Am 30 Years

Hi my name is Tiffany and I am 30 years old. I have been having chest pain since 2008. It feels like it is on the left side of my chest. I have also noticed that I have been having pain in my arm, neck and back. I went to the ER and they did a EKG and took an X-ray and those test came back negative. The only time I feel the pain is when I am sitting down not doing anything. I feel it when I drive, and when I walk sometimes.