HI, I do arobics while using 5lb weights every morning.Today I was lefting the 5lbs out & up from my side & I felt a little sting in my arm about 1/2 way between my elbow & shoulder(the outside) wasn't painful enough to stop my workout, but about a hour after my arm is very painful in the spot that I first felt the sting ,whenever I reach out to do anything. Doctor, did I tear a muscle, if so how do I treat it @ home?when can I continue my weight lifting? Thanks