Try reciting the Litany Against Fear:
I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain.
The litany is from a science fiction book written by Frank Herbert (Dune), and has proved itself useful to many people trying to overcome their fear. It's powerful because it forces you to visualize as you recite, and it gives you something to focus on other than the fear.