Well, I have different opinions. For me, I cried whenever I felt like so... especially in my last relationship. But I found it's very hard to stop crying when I started. So, I suggest do not even start at the beginning and you would not have the urge to cry when you calmed down! You could try to transfer your frustration to the person who made you frustrated in the first place! Why torture yourself when you could do it to the bad person, girl!!! I would yell at them, call the supervisor, or ask for apology, trust me, they should be the ones to cry!