On friday i was doing my usual chin ups for the beginning of the workout. Then on my last one of my last set, i pushed my hardest and did it. But a couple of seconds after i got to the ground, my head just started to hurt so bad. It just throbbed for like 5 seconds. I grabbed my head and fell to the ground and sat on the bench for a while. Then called it quits and went to take a nap. My head hurts everytime i do something too hard or something too heavy. I am wondering what was i doing wrong and could my neck be kinda sprained?