Don't think this is really of any help but I'll try. This is what happens to me sometimes....

The anxiety and stress (things as you perceive them not necessarily in reality) will build up and keep builting. The something will happen (for me I usually blow up about some totally unrelated subject).

Next day, later the same day...just depends, I'm numb. No feelings, no emotion usually replaced by quilt and drepression.

I hope this makes more sence to you than it does to me. But I know it happens.