This lasted for about 5 minutes or so, and has never happened to me before. I was sitting down and all the sudden my shoulder blade started to hurt. It felt like a burning bruise that someone just keeps pushing on. Then my left arm went tingly and my hand was slightly numb. I started to freak out a little because this isn't normal obviously. Also, my chest started to hurt but just slightly. i sat quietly and tried not to move until the pain went away. I am only 25 years old and have no history of heart disease in myself or my family. I am all in all very healthy and active.