For One And A Half Weeks Off And On Left

For one and a half weeks off and on left side head to shoulder down to hand mild discomfort as if tired muscle or aching muscle from flu. Also at same time periods of light headiness and shortness of breath. Each episode only lasts about 10 to 15 minutes. their is approximately 4 to 6 episodes a day. They happen more so with physical activity. However I have woken from sleep with same symptoms as well. Emergency room visit or not?