Hi I am probable worring over nothing but.. I have had very bad chest pain for the last 48 + hours, it is just under my left breast, it becomes extreamly bad when I take a deep breath or laugh. Also when I woke up this morning, after going to sleep with this last night, my left arm was also painful and a little week, my arm is pretty much better now. Any idea what may be wrong? Many thanks Nicola wood