Horrible thoughts are keeping me from sleeping?

I'm 13 years old and i have these horrible thoughts at night, they keep me from sleep. Thoughts like, killing my family, myself, or just thoughts like them dying and i will cry...,thoughts of devil worshipers, and i'm scaring myself and i need some help for real. Some help quick because i don't want to harm anybody or even myself. I am a Christian, Yes, i'm a Believer. Sometimes I Pray and ask God to ease my mind and i black out (space out) and when i wake up the next morning i don't know how i fell asleep. Somebody please help. I told my mom but she wasn't any help. Maybe you could be? I hope!