In John's wedding, when their talking to Major Sholto through the door, I noticed something.
When Sherlock is trying to act all clever and smart and calm, his hand is shaking, just like John's used to when he came back. He has to physically make his hands into fists to stop it.
Sherlock nearly died trying to catch Moriarty, even after faking his death. He did it without John, the person that kept him on the right road. Sherlock is realizing he has emotions and he doesn't know what to do about them because the last time he felt emotions was when he was a little boy, and he likely had Redbeard.
Sherlock has PTSD.
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Random Sherlock Oneshots
Fanfiction"I know this is a bit stupid. But..... Happy Birthday Sherlock........... I know this was a waste of time...... Why would I say happy birthday to a grave?" -John Hamish Watson