The Doctor ran to the TARDIS console. He had to get out of there, he had to see someone real, but where? "Come on, think. Where, where, where..." Suddenly he remembered a place. Of course. He walked around the console and set the coordinates to Stormcage Containment Facility, 52nd century. He waited impatiently for the TARDIS to land, and rushed to the door, now unlocked. He ran through the prison's hallways, looking for her cell, but he ended up bumping into her instead.
"Oh, hello sweetie." River said, taking her sunglasses off. "Don't mind me, just escaping prison for a little while. It can get quite boring in that cell." She was smiling, but The Doctor wasn't.
"Is it really you? Please tell me it's you." he said, touching her cheeks, her nose, her hair. She held his hands and stepped closer. "Of course it's me, who else would it be?" He looked into her eyes, doubtful. She was real. Not even the strongest hallucination could fake those deep green eyes, or that sarcastic yet concerned look she was giving him.
He broke down in relief, and hugged her tight. "Oh thank god."
"Are you alright? You're acting stranger than normal." she asked as she hugged him back.
"I'm fine. Now I'm fine." He pushed her away to look at her again, and she smiled at him. But her face began to melt, and later every inch of her skin and clothes, until The Doctor was holding River's skeleton. He screamed and stepped back, but she was already back to normal.
"Doctor, what's wrong? You are starting to scare me."
"How about that." The Dream Lord said, now standing next to The Doctor. "It looks like you don't have to be asleep to have hallucinations. That makes things even more interesting." he smiled, and faded away.
"Doctor? What are you looking at?"
"River. Do you you anything about the omegahnian's delusion potion?"
"Yes, the one they use on their prisoners before they interroga... Oh, no you didn't."
"Oh yes I did."
"Why on Earth were you anywhere near an omegahnian troop in the first place?"
"You know, trying to save lives, failing, being tremendously useless for a change, not the point. Do you know how to cure it? Please tell me future me told past you how to cure it."
"Actually, you left me a note in my cell not long ago. It said 'hit him really hard on the head'."
He widened his eyes, rubbing his hands together, like he usually does when he's nervous. "Really?"
"No, you idiot. But you did leave me a note, along with this bottle." she said, going through her purse. She took out a small flask with a red liquid inside. "The note said 'the taste is horrible. You're going to have to shove it down my throat. Don't let me spill it. Believe me, I'll try. It will make me pass out, but don't worry, I'll be fine. You'll know when'. I didn't think I would need it so soon, but I suppose it's now."
The Doctor nodded.
"Open up, sweetie. This is not going to be pleasant."