Ugh, so sorry to hear that. Lyme is very common, unfortunately, in my town. Whenever my kids get a headache the first thing I think of is Lymes. I don't know if you have a lot of ticks around your house (we do), but we ended up putting these tick tubes around the perimeter of our yard, which seemed to have helped a lot. Don't beat yourself up on not knowing...Lyme is really hard to catch because the symptoms vary so much and mimick other things.Hoping he feels better soon!