What could cause constant pain in sternum and left ribcage?

For the last two weeks I've had this pain on my sternum and left ribcage. My first symptoms were so bad I ended up going to the ER b/c my wife thought I was having a heart attack. EKG is fine, blood pressure is fine, x-rays and CT scan are fine. I've just got this constant pain in my sternum and left ribcage. It feels like someone is standing on my sternum and every now and then someone else comes by to kick me in the ribs with pointed shoes. The doc was thought it was pleurisy and put me on a prednisone pack but it didn't help. I'm taking about 5 500mg hydrocodone a day for just to keep the pain at a tolerable level. The only other conditions I have are ITP (bleeding disorder) that's being treated by winrho and slight pectus excavatum. Any tests or theories I can suggest to my doc? I'm really tired of hurting all the time.