Wow. This just goes to show that people really don't understand. I have this issue too. I am very healthy, successful, great family, no depression issues, nothing bad has happened to me - probably an abnormally lucky person. But I cry very easily. If I am reading a book to my child and the underdog wins, I cry. I actually tend to cry on happy things - when I realize that someone did something kind, I cry; or when my boss shows he cares along with any other person that shows anyone that they care - I cry. In my mind there is no problem and the crying is very brief and then no thought is given to that situation again. When in true trouble - pretty rare - I actually tend to be very logical and very analytical. (I am an engineer, afterall) But I have the exact same problem as the person described. I get in situations where I will have to stop speaking altogether in order to hold back my voice that has disappeared (will come out squeaky) or outright tears in my eyes. When this happens, I know it is emotional, but totally not worth the tears. I would compare it to quicker-than-normal release of tears during PMS, except that all the other feelings such as anxiety, sadness, (and pain) are not part of this everyday crying disorder. It feels like it is so unreal that something must just be in imbalance. I have considered hormone therapy, but since I only have this one symptom, I don't know that I am ready to take something that may give me other side effects. It is a fact in my life that when I go without sleep for extended periods of time, it is almost a sure thing that I will cry for absolutely no reason when the slightest thing comes up. So I try to get my sleep. But that also tells me that my body produces something that controls this and it produces it when I sleep.
I'm sure this person feels the same way I do about this. It is something that can really be defeating at work in our high profile jobs (I work with governments around the world). Yes, it is controllable, but to control it, we must hold back or change our course of action which, in turn, undermines what we are trying to accomplish. It can - many times- make us react inappropriately because we know what to do but cannot do it and end up doing nothing. Nothing is considered a choice and has a meaning - not the meaning that we wanted to present.
I hope that someone understands and there is a better answer than what people have responded above. People know themselves. If they say they just need a pill and therapy isn't going to help, it isn't necessarily because they are in denial. If you have a problem, you will do anything to resolve it. But if you have lived with it for a long time, you know enough that it is chemically driven and behavior may not be the answer.