Sacristia
I had something like that happen to me, just out of the blue. I did that at work once and my co worker was shocked because I am one not to show personal emotion as crying at work openingly unless I am really hurt.
It just hit me. I wasn't thinking about anything particular because I was working, I guess that is what shocked me. It was really unwarranted.
All I can figure out is that as I was fasting (and it was a long fast ) my emotional state and mental state was releasing something pent up in my inner mind that I hadn't released yet. After I was done, I felt great, if not a bit achy but I felt a bit more unburdened for some reason.
It was almost like my body needed me to cry and I didn't really know that reason why. So I don't think there was anything wrong with it even though I don't know why I did it.
I know that most of the time my body knows more then I do, so I just go with the flow.