What Does Chest Pain On The Left Side Indicate?

Hi, I've had this left chest pain in my breast, ribs, and back for about a week now. I went to Urgent Care Sunday and they did a quick EKG and said no heart attack... She said it might be costochondritis, gave me 1/day for 7 days amount of Meloxicam. It is now 3 days later and the pain is worse. It's radiated to my neck, shoulders, under my arms, my upper spine, my right ribs, my arms, I'm weak, I'm achy, I'm so tired but can't move or anything...