The Doctor paced back and forth quickening with each step until he was running in a straight line. He glanced at the empty place where the Ponds would've stood telling him to calm down, he stared at the console where Rose sometimes sat laughing at him, and he glared at the doors where so many had left and never came back.
"Keep it together Doctor," he whispered his mantra once again. "Keep it together." But even with his continuous mantra he felt himself slowly losing himself. This was the seventh time its happened since his tenth regeneration, he'd learned to keep it bottled up for long but sometimes he still found himself without control of his actions.
As far as he knew it had started a millisecond after his ninth regeneration. Something had gone wrong with the process (if it was the time vortex in his head, he'll never know) and his mind had left him. He'd almost killed his Rose by raising the Tardis's speed to something in the thousands and talking absolute gibberish in Gallifreyian.
It was only after the Mars catastrophe that he realized that he had a name for his insanity: Timelord Victorious. When he regenerated he'd hoped that Timelord Victorious was gone and it was over. But no luck. He'd found it was back during the Flesh incident, he'd blanked out and when he regained control of his mind he saw Rory staring at him in horror. Muttering about how he was just crazy and how he wouldn't let him stop him from saving Amy.
That's how it went when he was Timelord Victorious. He sometimes knew it was coming, most of the time not, but it would usually go dark. Pitch black and he couldn't hear or see a thing then after the insane man finished his damage he'd leave the Doctor to clean up the mess. It's happened more and more since the Weeping Angels took Amy and Rory, it was his consciences way of saying,
"You not okay. If you don't do something we'll send someone who will." And Timelord Victorious will. Clara had helped but they're were the six days out of the week where she wasn't there leaving the Doctor to think about the past or wait for his alter ego.
"Tick tock, tick tock." He heard himself say. He continued to say the words over and over getting faster and faster until the words where just a blur. He held his head in his hands and a pounding headache took hold. The Doctor leapt to the console and flicked up buttons in a seemingly random order hoping for them to take him to Clara's as fast as he could. The corners of his vision blurred and began closing in until darkness.
His vision cleared for a moment and he stared at his face in the reflection of the centerpiece. He had a glint of unmasked insanity of in his eyes and he skipped around the Tardis just whispering,
"I'm back." Over and over. The Doctor was powerless to himself just watching himself twirl and flick buttons that made the Tardis shake and groan.
"Stop hurting her!" He wanted to yelled but talking to himself was useless. Talking to the manic willing to do anything was useless. Terror closed in as he realized that he'd set to coordinates for Clara's house, she didn't know about Timelord Victorious. No one did. He'd kept it a secret, he was already the bowtie wearing alien who has a police box shaped time machine, no need to add 'also has a relentless maniac as a alter ego'. Clara was in danger by being in a 3 mile radius of him and so was everyone else. He concentrated hard trying to move his own hand to change the course but Timelord Victorious was strong and looked in the reflection as if trying to face the Doctor,
"We're going to see sweet Clara. Get comfortable you're not waking up for a while, nighty night Doctor."