Im worried that i have a brain tumour ... please help me.?

im 14 and i might sound pathetic but , i sometimes get migraines, but its only really when im on my periods or im stressed out. and these last few days ive had a reallyy bad headache which just hasnt gone away! i feel absolutly crap and i cant sleep. its not a migraine but its just a horrible headache. sometimes my hands or my legs will twitch and i dunno i just have a fear that i have a braintumour! i know i dont really have any symptoms but im scared and i dont wanna talk to my parents about it. please help meee.