Im a 28year old female I have a pain down my right arm , it feels like the veins , I woke up in the middle of the night with the shooting pain , it starts at the tip of my shoulder and goes all the way down my fingers - I havent injured myself or shoulder, and I wasnt sleeping any different , its like an ache all the way down my arm and followed by the sharp pain. ,what could it be? and when should I go to the Dr.?