have been getting pains on the left side of my chest for a few months now, mostly when leaning over the area or tilting my head down towards it .. also recently began feeling a slight numbness in my left arm, not really numb but just enough to notice. Im 23 years old, been involved in sports and fitness all my life, more recently lifting weights and doing martial arts training and have always been physically fit. Diet is very mixed though and have tended to eat alot of takeaways and greasy foods aswell as the healthy stuff, and also went through a spell of taking legal highs (that give a similar effect to cocaine) and for these reasons i am worried this could be something serious. Had heart rate and blood pressure taken and was told from the doctor they were both perfect. Any thoughts on what this could be?