I have a similar tendency to cry for no reason, often within minutes of feeling quite good. After many years of trying various things, from cognitive therapy to anti-depressents, I have come to the conclusion that the real problem is not the crying, but the sudden shift in mood. I have come to accept these sudden "mood swings" as symptoms of some form of bipolar disorder. Although I am less likely to notice "manic" episodes, doctors have told me that some forms of bipolar disorder are primarily depressive with only mild mania (bipolar type 2), and there is even something called monopolar disorder. It can take a lot of courage to seek treatment for this kind of thing, and no treatment is perfect. Currently, I'm finding that Seroquel helps a little, although I don't take a high dose for fear of weight gain and diabetes. I also rely on Clonazepam as needed, which is primarily effective not because it helps me feel "better," but because it helps me feel "less."