I (24F) have a good life and am very happy, I have a great job, a decent family, friends, a wonderful boyfriend, etc; not perfect but quite content.  But I regularly find myself crying for no apparent reason.  Sometimes I will be fine for weeks or even months and think I am fine.  But sometimes I can’t help but cry a lot.  I cried yesterday afternoon and today afternoon.  First I get really irritable and try not to cry and try to think or reasons that something is the matter.  I don’t know what is wrong with me or what I should do about this.  Is there anything I can/should do about this?