The truth is, the best way to figure out what is and isn't a herx is to keep a good, detailed Lyme journal. Keep track of which symptoms get bad and when, and journal what's going on in your environment. Herxes don't always happen instantaneously. They can occur hours, days or even a couple weeks later. When beginning a new medication, you want to pay close attention to your symptoms for a while.
"The most common symptoms reported include increased fatigue, joint or muscle pain, skin rashes, photosensitivity, irritability, paresthesia, dizziness, sleep disturbances, asthenia, muscle cramps, night sweats, hypertension, hypotension, headaches (especially migraines) and swollen glands. Also reported are heavy perspiration, metallic taste in mouth, chills, nausea, bloating, constipation or diarrhea, low grade fever, heart palpitations, tachycardia, facial palsy, tinnitus, mental confusion, uncoordinated movement, pruritus, bone pain, flu-like syndrome, conjunctivitis and throat swelling" ("Herxheimer...").
So if you have a full blown fever and have been exposed by all those kiddos, it might be the flu. According to everything I have read herxing is a low grade fever.
If you have the flu, you have 72 hours to do the Tamiflu stuff and you need to stay away from everyone.
Healing hugs. Like you need something on top of lyme --- NOT!