River sat down in a chair beside Amy's bed and closed her eyes. When she opened them, though, she did not see the walls of her mother's room. Instead, she found herself in a poorly lit hallway.
River knew she was hallucinating, but she couldn't seem to snap herself out of it.
"Hello, River. Or would you prefer me to call you... sweetie?" A rough, unfamiliar voice asked
"Who are you?" River said, she looked up trying to find where the voice was coming from, but the lighting was so dim that she couldn't make out even a silhouette of someone.
"Oh, you know very well who I am... I am the feared, evil... SCREAM LORD!" He laughed a maniacal, terrifying laugh.
"I know I'm hallucinating, but you can't take over, I will not allow it!" River screamed
"Well, let's just see about that, shall we? Why don't we just turn the lights on?" The lights flickered at first until they steadied, revealing two bodies: Amy and the Doctor. They were lying on the floor, lifeless.
"River!" Rory yelled, he looked at her with a face of fear and helplessness.
River Song reached out to him over the corpses, but before she could touch him, he fell to the ground, never to get up again.
"I know this isn't real, so stop it! Just stop it!" River cried
"These are your worst fears, correct?" the Scream Lord began "everybody you love died and there's nothing you can do to save them." He laughed his horrible laugh again.
River didn't have anything to say to that, instead she closed her eyes tight, wishing for it all to go away.
When she opened her eyes once again, she found herself in a familiar room, but it wasn't the comforting type of familiar she'd hoped for, she was in the room of a woman she despised. A women who had taken her. Used her. Madame Kovarian.
Madame Kovarian now approached her, smiling and laughing and being her horrible self.
River shut her eyes for a long time, hoping she would find herself back in the TARDIS.
She did find herself in the TARDIS when she opened her eyes, but not in Amy's room. Instead she was in a narrow hallway.
At first, she was alone as she made her way down the hallway aimlessly. Soon, though she was greeted by the unpleasant, but now familiar sight of Amy, Rory and the Doctor dead.
She looked forward, knowing that if she looked into the faces of any of her loved ones she would cry.
She walked down the hallway to find Madame Kovarian laughing, daleks exterminating the ones she cared most about as they cried out to her and the Scream Lord's laugh in the background.
River kept walking down this hallway until she realized that she wasn't going anywhere. She leaned against a wall and was soon surrounded by images of her fears.
She closed her eyes tighter than ever before and slid her hands over them.
When she opened her eyes, she found herself alone, floating in space, amongst unnamed stars. There were no planets, no space junk, besides the stars, she was absolutely alone.
"Here it is." The Scream Lord said after a minute. "Your worst fear. You're all alone, no one you can save, and most importantly... No. One. To. Save. You."