ive had this happen to me before i get like this weird thing in the back of my neck on the left side like of a sharp pain, but only when im going heavy. it doesnt happen anymore but it used to when i wasnt as experienced and i think it happened becuase i forgot to breath during the set. i just stopped weightlifting those days (happened 2 3 times) and it hurt for a little while but then went away. i would say just take it easy for a day or two