Jon has mentioned the different categories but he wasn't really willing to tell me all of them. I guessed a few and he confirmed but if I couldn't figure it out at the time, then no confirmation.

[Tim has some more ideas of possible fears. He knows a lot of things people are scared of but sorting them into the categories that Jon's world has is different.]

Okay so the worms started stalking people, or rather Jon? so what happened next?