Anything in general?
My biggest fear is vomitting. I'm not going to go into a big rant about it, if you really want to know what it's like to be emetophobic, you look for some posts I wrote about it.
Last week, Shelby informed me as to what a horseshoe crab is... now I'm afraid of them.
Leeches.
Jelly fish.
Lovebugs/big huge misquitoes with long legs that mate on my window screens.