I worked on towers, normally 100' to 200', for years. in 2001, I 'froze' half way up a 200' one. It took alot of instant self therapy to get ahold
of my fears and continue up. That newly aquired fear has not left me yet, and it's been a decade, so I doubt it's going to leave anytime soon.
So, to answer the question "am I afraid of heights?" Anything over 50', Hell yes..