Darkness

I was lying in bed, reading late like always. Then I felt something grab my wrist and shove my shoulder against the bed post. I couldn't see anything there, and I do have a bright night light because of my extreme fear of the dark to the point I start shaking. I have heart 5 conditions, so I was freaking out about my heart stopping. It released my shoulder and grabbed my throat and I could hardly breathe, and speaking came out in a whisper. My one friend I told about some footsteps I heard in the walls from awhile ago made an off comment about this crazy chant she once heard (by the way, I have an 18th grader's memory, so I remembered it, which surprised me to counting the fact the situation) and I kept squeezing it out until I felt it release me. The footsteps are now gone, but my fear of the dark has increased dramatically. I'm still afraid to go to sleep, which has been effecting my grades. Even when I manage to get to sleep, I get dreams about people dying, fires, and other things that happen in real life a day to two weeks after I dream it. I have told myself it won't come again, but as soon as it's dark, I freak out like a cornered cat in a room full of chainsaws. Can someone please help me? I'm not afraid of things I can see, when I was 6, I saw Tremors and just shrugged my shoulders and went off to get ready for bed. Mega sized fantasy creatures don't attack you in real life, it was easy to practically sort my issues, but this is something I just can't put out of my mind.