Thunder. Stupid thunder. Thunder can't hurt me.
And it never used to bug me. Not until I was 20 and woke up from nightmares in the middle of one of the worst thunderstorms I've ever been in.
Ever since, hearing thunder makes my skin crawl. I used to have panic attacks for the first few years after that incident, but it has since appeased to just a sense of dread and a sinking of my stomach. I woke up this morning at 4am to it, it went away, and I was able to start my day in peace. The sun even poked its head out.
Now, it's back.