I've had an ache/weakness in my left arm for the past 5 days. it radiates from my left shoulder all the way down to my fingertips, with particular painful points being the around the elbow and wrist. I've not hurt my arm in any way, and being only 21 am hoping/assuming that i dont have heart disease. Oddly, when i'm relaxed, such as the first few hours of the morning, it doesnt pose that much of an issue, but as the day wears on it gets worse. I've tried making an appointment with my local GP, but they were fully booked - should i be worried?