Dear Welcome to HCM We understand your concerns I went through your details. Masturbation cannot manifest any health related problems if practiced moderately. Masturbation does spend much energy and is stressful for the body and muscles. At your age, there could be other accompanying medical problems which could enhance the stress. The terrible headache could be associated with this stress factor and energy loss. It will be an advisable option that you recall all the incidents took place before the masturbation including food, physical activities, stress factors etc. You could get an answer to your question provided you are not inclined to anxiety and obsession. If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible. Hope this answers your query. Available for further clarifications. Good luck. Take care.