Sorry to hear that.
I know nothing about ticks. I stay out of the woods etc -- not that I live near any woods anymore anyways. The worst bugs we get are giant cockroaches and giant waterbugs, and occasional scorpions. They are all nasty, creepy, slimy, and scary, but I don't think they're anywhere near as dangerous as ticks. And I know you've got rattlers down there too. Nature is scary!
Hopefully you guys figure out what's going on. I hate waiting for answers.