Fear switches off the supercomputer part of your brain and puts the primitive part in charge - thus reactions in place of responses, a lack of self control and simple solutions over ones that take the feelings of others into consideration.
When fearful we are all semi-drunks, for it switches off the prefrontal cortex and thus has a similar effect to alcohol.
Fear has a biological reason and purpose, it is a mechanism to keep you safe. It is part of your natural intuition. Yet once those feelings of fear have had a little time to be processed, the higher brain switches back on to make the real choice about what to do, to make a real plan for a viable solution.
Fear is the trigger between our "hulk" self and our "Dr Banner" self, our primitive and our more logical, creative and empathic self. As such we need to find our own lullaby, find whatever returns us to our best self before we smash up what, and who, we love.
When I am fearful I recall that fear evaporates when the brain is encouraged into a more meditative mode, it is a way to poke holes in that fear-bucket and let it drain. Then, when in play, sport or daydreaming moments, solutions begin to arrive - kinder and more intelligent that the ideas that came before.