This is making me miserable :(?

its been months since ive gotten a good nights sleep. it takes me forever to fall asleep. im 15 and everytime i close my eyes to go to sleep thoughts just race through my head like crazy! i start thinking of every stressfull think in my life there is! family issues, friend issues (there have been alot latley.) anyways im up till the am's every night. and once i do fall asleep i have the worst nightmares ever..mostly about losing people i love and stuff like that.i wake up and my eyes are wet from crying in my sleep. its not like depression because when im awake im a normal, happy (mostly), teenager. i just cant stand nightime because of these problems. i also feel bad because my bf feels bad when he falls asleep and he knows i cant so he stays on the phone with me untill i fall asleep sometimes and he tells me to call him when i have nightmares.. (usually i dont cuz i dont like to wake him). its causing alot of stress on me and i cant even handle it anymore. i dont want to ask my mom or dad to take me to the doctors for a sleeping prescription because they would think im over reacting and blame it on caffine. i guess this kinda all started when my bestfriend stabbed me in the back....but i dont see why tht would make me not be able to sleep. please i nceed advie