Hi, I Am A 36 Year Old Female .. I've

Hi, I am a 36 year old female .. I've had several episodes where my left arm goes numb and I get clammy and nauseous. I've been to the ER and they've done all kinds of blood tests and also a CT scan, I've been to the cardiologist and they did a ultra sound of the heart plus blood test and stress test and everything comes back normal. I am scared that one day I will have a stroke or heart attack! Do you have any recommendations on test I should ask for?