Irrational fears are illogical and for the most part, groundless.
Knowing this does absolutely nothing to make them go away, or make them any easier to face. I’ve got one major irrational writing fear that keeps rearing it’s head from time to time…
I find myself worrying that I’ll die before this damn book is finished. Which if you think about it isn’t really irrational because it actually could happen.
Anyhow, I’m concerned that I’ll kick the bucket and that someone somewhere will step over my decaying corpse and find my almost complete manuscript.(I would never print out an incomplete manuscript, but whatever, somehow in this crazy scenario I did and apparently had it next to me. ) Curiosity would compel the stranger to read it, and once they’re done with my very incomplete/rough version they’ll think to themselves “My god, she was a shit writer.” 
Meanwhile I’ll be in the afterlife, pulling on my halo and flapping my archangel wings, screaming “IT WAS ONLY THE FIRST DRAFT!” *sob* “THE FIRST DRAFT!”
s a m • k a s s é 
Keep going! The end will eventually come so long as you doing give up. Just be very careful crossing streets and going up and down stairs in the meantime. 🙂
Don’t forget chewing food! I can’t choke to death when the completion of the book is within reach.