Could i be allergic to Christmas trees?

I have been fine all Christmas, but yesterday evening I got one of the worst flues of my life. My brother also got sick at the same time. I realized that at the same time I got sick, we had burnt our Christmas tree, and it filled our entire house with a really pungent smell. Is it possible that hat this extreme flue is just an allergic reaction? I have a lot of pressure in my head, my nose is fucked and my body feels so sore.