i am 14, about 1 foot 6 and about 60 kg, all all day today i havehad massive pains in my head everytime i stand up, and i know its not head rush because i do have low blood pressure and get that often , but right now this pain in my head is killing me and it feels liek what my friend used to have and she went to the doctors to cheak it out and she had a brain tumour so im really scared