for like 2 weeks i have the weird head ache ... when i shake my head up and down my head hurts .. its not like a regular pain ... idk how to explain... it really anoyes me ... for past few days it only hurts on back of my head sometimes it goes away and comes back when i shake my head . also it goes away when i am doing staff like working out or talking to someone or getting excited or something like taht . i dont have any vision problems or something like that . i am 16 years old . and also i feel good when i take hot shower or do a head massage . plz tell me what it is . is it a tumor ? do i have a stroke? plz tell me . thanx