Just one of those days

Have you ever had one of those days where everything seems to be going okay, you're hanging out with some friends-goofing off and making jokes, but when they leave you just fall apart? Like a certain shattering just happens to your inner being and you start crying out of nowhere. That kind of shattering, and the fact is that it almost hurts enough to feel like you're literally shattering.
It's like one of those days where everything is going...okay but something deep down keeps bugging you, so what do you do: ignore it and hope it leaves you alone. So you go about your happy day making memories, talking with others, dancing until you realize that that certain thing that was bugging you earlier hasn't gone away. Now why not, you ask, when most things in this society is solved by just ignoring the problem?
Now one of two things could happen:
Either you will realize what's been bothering you and fix it or be upset and try to calm down or something. OR you can just feel this vibe in the air and end up plain crying for no particular reason, or you DO realize it and just feel like crying to make it all better.[Not likely by the way.]
Well that's how I ended up feeling like today. I had a blast with a bunch of people and became very exhausted but overall I thought it was all good. I still can't quite figure out what's been bothering me, but these unexpected burst just keep occuring. And the fact that I feel so helpless from the random outbursts that I just feel even worse overall. What's wrong!?