I ran onto the street, my head swimming. My brother couldn't be dead, he couldn't be. All those times when we got in fights, when I yelled at him that he was an idoit. I wanted to take it all back, I'd gladly take it all back for him to be alive again. And that's when it happened. Suddenly someone came from behind me. I felt a syringe go into my left shoulder. Pain shot down my arm. I started to feel faint and I was dimly aware of myself falling, then everything went black.
A hour later I woke up the hospital, except I was looking at my disorientated body. I heard footsteps outside the door and quickly crouched down. The nurse came in and laid the sheet over my head, I was dead? Impossible, suddenly my parents came rushing in.
"Is she all right?" My dad asked, then he saw my body. "No!" He cried out. I wanted to rush out and hug him, to tell him it was alright, that I was still here. But something in the back of my mind urged me not to. And that's how my journey for revenge began.
I actually want to edit it some more later. I just only had some time right now.

when I yelled at him that he was an idoit.
You can do a lot of things with figures of speech. Be sure and experiment.
Oh, by the way, it doesn't have to be a metaphor or a simile. You can just describe it as, "his face went white." "his face lost it's color." Basically, the choices are limitless, and you as the writer, have the freedom to chose as you wish.
And as you see, there were quite a number of technical errors.
