I have a very serious fear of flying. It came on super suddenly too, about a year and a half ago, and now I panic just thinking about having to fly, even if it's months away. It's just so sickeningly unnatural to voluntarily walk onto a plane, because I legitimately think I'm going to die. HOWEVER I got a prescription for Xanax to take only when I fly, and it has just short of completely changed my life. Highly recommend talking to a doctor if you're as scared as I am.
Less seriously, open water creeps me out to no end. I would never be comfortable on a cruise.
A little bit of claustrophobia too. I hate sitting on the inside of a booth, or in the middle seat of a car. yikes

doesn't help with flying lol.
I think I just have mad anxiety.