Is Chest Pain After Strenuous Work A Cause For Concern?

Hi, I m a 29 year old male and was diagnosed with Costochondritis a few years ago when I experienced chest pain in the left side of my chest that sometimes could be felt in my left arm. It s never gotten any worse, and I stay in very good shape. However, this morning I donated plasma (which I ve done successfully many times in the past) and then drank a large coffee after, followed by some somewhat strenuous yard work. Toward the end of the yardwork (about an hour), I lifted a heavy wheelbarrow and started to feel a pain in the middle of my chest different from any other pain I ve had before. It triggers more when I raise my left arm or use my left arm to grab things (even lightly). I ve been drinking lots of water and had a protein heavy meal as well as took a nap, but the pain is still the same a couple of hours later. Is this enough to warrant an emergency room visit?