I am in the process of conquering it.
I find what really helps is to 'exteriorise.' All that means is just sort of LIFT YOURSELF out of the state you are in, it takes practice, but it can be done.
In fact, I'm sure thats how you beat it last time.
Don't let it scare you. It can't hurt you.
Accept it, feel it, then simply lift yourself above it and ride it out.
Its sort of like ignoring it, but not forcing yourself to, cause that will make it worse. Just sort of accept it and then lift out.
Hope that helps.