Not sure where you are from, but the differneces in climat might affect it.
From Chicago - I know moving to a new place (esp. a new continent) can present some health challenges, but this kinda surprised me (esp. this time of year). The sun comment makes sense - it hasn't rained recently, so perhaps the air is full of pollen.
Sorry to hear that others are affected, but I'm happy to hear that I'm not alone...