It had been months since the TimeLord had lost /his/ Clara. At first he had denied it, said to himself repeatedly that he'd find another of her echoes, but when that failed to happen; he has crumbled and fallen harder than he ever had before. Harder than when he had lost Rose, and Amy and Rory, and even his wife, River Song. He had fallen harder than when he had thought he had burned Gallifrey. And even more so than when he he had lost companion after companion.
The Doctor was in a permanent state of grief, or that's what it was seeming like. The memory of how Clara had died, it haunted him everyday and every night. He would awaken in the middle of the night, crying out and covered in an icy cold sweat that seemed to cling to him, even after he had showered and changed. He was worse than anyone had ever seen him before, worse than when he had situated himself on a cloud after Amy and Rory had been taken from him.
But then... Clara had been taken from him too. She had been taken in the middle of the night, never to be seen again... Not until he had received a message. As the memory came flooding back, an involuntary sob broke through his tightly concealed lips and his eyes had begun to water. The Daleks had taken his Clara, the person he held dear to him the most.. His only weakness. And when he had answered that message, and had tried to save her; she had been shot dead in front of his very eyes. Unleashing a fury that none of his enemies had ever before witnessed, causing them to cower in fear more so than the last time they had encountered him.
As the memory slowly faded, he dropped to his knees; sobs wracking through his body at such a rate that it could be heard in every room of the TARDIS. Every room except for Clara's... The room he had left and never before entered in fear of her memory fading if even so much as entered. But today... After he had managed to pull himself together, he made his way there. And upon arriving, didn't even hesitate to unlock the door and make his way over to the bed, collapsing onto it and drifting into a deep sleep. Such a sleep, that it felt like death itself as the memories invaded his dreams, both the good and bad...