I have acrophobia, or a very irrational fear of heights. 
There's nothing irrational about falling to your death.
Well, the thing about acrophobia is that you can feel that immense fear, even when you aren't particularly high up. 
So even if you're just standing on top of something short like a stepladder?
Yes! Sometimes I will experience panic attacks when i am in a high place as well.
How do you eventually deal with all the fear?
Therapy, and Xanax whenever I have to take a flight!
Hey, whatever it take for you to get by.  Hopefully as time goes by you'd need less of them both.