I am 54 yo woman. I had a heart attack in June and a stent was put in. I just finished cardio rehab classes. I worked out today (tread mill, weights) like i ve done in class. About 3 hours after that, I started to feel cool on the left side of my back; warmed up in about 20 minutes. About 1 hour ago, i started feeling a rush or wave in my left wrist/upper hand area. (feels like when your arm is asleep and then it starts to wake up.) I am not having any other issues and i am not numb in that area. My dr. office is closed; didn t know if i should go to the ER? or just being too cautious since my heart attack. Thank you for your opinion.