I m 19 years old and have been experiencing a deep dull chest pain on and off for about a year now. The pain is located near the center but slightly to the left of my chest. Each episode will last for a couple of hours on and off all day. I haven t been able to pin point anything that triggers the pain. It seems to just randomly happen. I ve been to the er for this before and they did an EKG which came back normal and diagnosed me with pneumonia but I didn t show any other symptoms of pneumonia. On days when I have the chest pain, I do experience a loss of appetite and low energy. I m currently taking Zoloft for my depression but have never experienced any problems with it and I m a pretty healthy person.