Right. Being overly tense being one of my problem areas and always contributed to headaches. I'd think being too tight would contribute negatively when it comes to taking shots, though having weak neck muscles adds to the whiplash effect. I wonder if the OP suffered at least a minor concussion. If that the case, taking more head blows till it heals wouldn't be a good idea. Its too bad - the lack of feedback from his instructor brought to naught the OP's opportunity to have the experience put into context by a seasoned pro and turn it into a valuable learning experience.