Heights are my ultimate fear, the most common nightmares I have are ones where I am placed in like a tall building and there are very thin walkways that are like 20 feet off the ground, clearly too high to fall and just get back up (these are almost 100% because of my middle/high school having a second floor where there was this balcony 20 feet off the ground that allowed people to see into the common area and its stage).
Spiders are kinda scary but tbh my fear of them is waning.
I'm also afraid of being in bodies of water, ranging from the ocean itself to literally a loving bath tub full of water. This fear usually is mitigated by being with other people and not being cold in the water. I just get this anxiety that something bad is going to happen, and I cannot stop thinking of like horrible storms and the possibility that like a sinkhole will open up underneath and drop me to dark, watery death. This also might be the only fear I have sparked by trauma since I've experienced many horrifying moments in water, such as almost drowning with my sister in a pool and fishing in the bayou when a horrible storm hit us, where it was raining pretty damn hard and the velocity of the boat made the rain feel like hail punching every part of my body. We did catch a lot of fish though, that was nice.