If someone does that to you again, just play normal moves. Don't rush, but don't worry -- they're just trying to unnerve you if they sac a queen for f2/f7 in the opening. anyway, good job showing your opponent that Queens are not worth pawns! 
unnerving q sac in blitz
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Probably read this recent thread
http://www.chess.com/forum/view/game-analysis/a-very-detailed-queen-sacrifice-opening-analysis
This game consisted of q sac by black that made me think longer and for most of the part I was running behind time(time control 3|0).
I was relieved when it was over.