Meaning:

to discipline oneself after going through a difficult time.

Synonyms:
get a grip on get over it, buck up(informal),

Sentences：
He’s finding it hard to pull himself together after the accident.
I’ll have to pull yourself together if you want to pass that exam.
He pulled himself together and got back to work.

Conversation 1
A: I got into a fight with friend this morning.
B: Are you all right? What happened?
A: We had a little disagreement on one issue that I just could not pull myself together and yelled at him.
B: It’s not you.
A: Sorry, mom.

Conversation 2
A Girl finds her workmate crying in the back room at work.
A: Hey what are you doing in here?
B: (Crying)
A: What’s the matter?  Is everything alright?
B: (Still crying) The boss just told me off, he said if I don’t improve then I will lose this job.
A: There, there, calm down, pull yourself together.
B: I don’t know what to do, if I lose this job I am in real trouble.
A: I know, but you are not going to make things better by hiding in here crying.
B: What am I going to do?
A: Well, first you need to dry your eyes and straighten yourself out, then get out there and prove him wrong.  Don’t let him get to you.
B: Thanks for your help, I don’t know what I’d do without you.

Conversation 3
A: Hi there, is Sarah home.
B: No she has gone out drinking again, I have hardly seen her for weeks.
A: She’s out again?
B: Yeah, she goes out nearly every night.
A: What happened? She never used to be like that.
B: Her boyfriend back home broke up with her a few weeks ago, and she has been going out a lot since then.
A: Oh I see, was she really upset?
B: I think so, but she pretends that everything is ok.
A:She needs to pull herself together, she’ll get herself into trouble if she keeps going out drinking all the time.  Can you get her to call me when you see her? And I’ll see if I can help her.
B: Ok, I will.  Good luck.
(Callan book4, Stage 8 757p)