My number one fear would have to be car accidents, I've been in a few minor ones (as a passenger) and they just scare the living daylights out of me. I feel like I'm going to be in a brutal car wreck someday, I imagine it all the time, worst feeling ! I hate being on busy streets/highways, I just cannot trust other drivers. I also don't like crossing busy streets, even at crosswalks, because again I just don't trust other drivers.
Another one, is injuries on other people, especially if they're bleeding. I'm fine if it's me who gets a cut, but someone else and my stomach is in knots if I see their blood. Other injuries like broken bones and whatnot, thankfully I've never witnessed them up close, just the thought makes me shudder though.
Lastly, this is a new one I've developed, due to one bad experience. I decided to donate blood, and I had trouble my first few times 'cause my veins were hard for the nurses to get (they're small apparently? Didn't even know such a thing was possible), but after a few times going I managed to donate. Recently I went to give again, and they finally got the needle in after trying forever, so I was sitting there waiting to fill my bag and whatnot, chatting with the people around me. I suddenly go veery sick to my stomach and dizzy, like the whole room was spinning, it was veery scary ! So thanks to that experience I now have a fear of giving blood or getting blood work done. Which actually makes me very sad because donating blood is something I think everyone should do if they can. Sorry for the rambling explaination, and I wouldn't wanna discourage anyone who reads this from donating blood, I'm just a very small person, that's why I had an experience like I did, it is very rare for it to happen so don't let my story scare you off!