Hi Jenn, Here's hoping that your bite has healed nicely by now; but, reading your post, I felt compelled to add what I would've said if I'd been here last month. If it doesn't help you, maybe it'll help someone who reads this thread later on down the road.
1) Be really careful with those sonic pest units. I've read that a lot of people have run into them actually ATTRACTING spiders; esp, brown recluse! (Why, I don't know; but, I ran into numerous accounts of it a while back when I was researching non-toxic pest control products for a friend who'd been invaded by roaches after bring home a box of books she'd bought at an auction.)
2) If I got bit and didn't have MMS1 around, I'd go hunting Calcium Hypochlorite (a form of pool shock) and soaking the bite with that. When you get your book, read up on MMS2.
Pam, thank you for the Desitin suggestion. I guess I missed that part in the book.