I legit have acrophobia. Like, to the point where if I climb more than the first 5/6 rungs of a ladder, I will turn pale and damn near piss myself if I open my eyes or look down. Thankfully I'm a tall guy so it rarely shows up outside of work when they want me to reset the AC unit located on the building's roof and only accessible via a fire ladder some 40 feet off the ground.
I'm pretty spooked by the dark, but I'm more afraid of someone breaking into my house than I am about being alone. Only fear I have about being alone is I won't be powerful enough to fight off something.