Fragmentation Bomb

how to describe your mood, when a million thoughts rush through your mind at once and you have no explanation of them.

You may get the feeling that your mind is about to explode and all emotions in one such as happy, sad, angry, excited are all jumbled into 1 emotion

A fragmentation bomb is this

Bob: "Hey Steven, how are you feeling today?"
Steven: "my mind is a bit of a fragmentation bomb at the moment."