I would suggest you to see a doctor and get a professional help.
whenever you feel pain your should relax and take deep breaths Also make sure you drink water properly.
I used to have such pain on my left side of the chest, and it was mostly when I used to walk a lot without drinking water...
Hi,
I noticed that you are focusing only on your upper body. I would suggest you to make a complete workout routine including legs and back too and not just chest and arms. Not only would it make your whole body strong (to do heavy shoulder press you need strong legs) but it would also also...