I have some mild anxiety and can convince myself to be afraid of anything that I find remotely plausible if I think about it too much. One time I was scared to start the lawnmower and another time since my family has a minor enemy I was afraid for a week that the car would blow up, even after it was already started thinking it could be time delayed or that it would blow after going 40 MPH or something. I heard a bird chirping at regular intervals exactly like an electronic beep and that made me wig out and leave the car immediately. After the batman theater shooting I went to go see it with my friends and there were only a few people in the theater but I was afraid someone who was late to the crazy party might bust in and shoot up the place anyway. It kind of made the movie suck for me. One time I went to the hospital because I thought I was having heart palpitations but I wasn't. I had had a couple palpitations in the past after drinking way too much coke. It gave me the idea to think about my heart all the time which is what caused it. Now that I think about it, I think I need to think about things less....
If I ever saw a real corpse I would worry it would become a zombie and sit upright to bite me as soon as I got near it. I could never be a mortician.
I'm afraid of being alone in the dark, plausible lightning strikes, something biting my legs off in open water, and social situations.
If I ever started hallucinating anything at all I would totally lose it. I know there's nothing as scary as what I can imagine.
But for the general persistent fears I'd say heights, spiders, strange-looking unidentified bugs and large predatory animals big enough to be threats if they decided to get nasty like a dog or a lion.
For things I'm NOT afraid of; Snakes rats and bats don't freak me out at all and I laugh at people who are afraid of them! Ha! Small spaces and open areas are fine. Being alone or lonely or the idea of having nobody doesn't bother me at all.
If ever there was an actual disaster-esque danger situation like a riot or gunfight breaking out or a tornado, huge fire, earthquake or a hurricane blowing shurikens I would take cover/evacuate and be completely fine. I think I'm mostly only scared of things I wouldn't see coming.