Not sure, but I've seen a show on parasites a long
time ago, and I just thought of it when I read your post. They showed different people w/different cases of parasites and other things (like a leach in ones man's sinus'). One had insisted he felt something crawling under his skin, he finally saw it in his eye and they were able to help him after that. Sounds awful, I know, but stranger things have happened. Do you remember any insect bites, traveled at all?