Good late morning.
TOD: Someone said drowning, above. I'd have to go along with that, and add claustrophobia. I've oft felt that if you wanted to finish me off but good, burial alive -- not necessarily Poe style, but you know, any kind of tight situation, might just do it.
As for critters and such: Rats, phooey. Make it creepy crawlies. Spiders. Certain insects. Sea creatures.
Oh boy. Time to go downstairs for another cup of coffee and get off this subject!