Pretty sure it’s the flu
Have you joined the 2017 Secret Cthanta yet?
Is "keys are still in it" a permanent card?
No, it's played instead of your normal movement but it is discarded after one use.
What is the point of the florist shop?
In some of the later expansions cards can be played in a "named" building. In the basic game of Zombies!!! it's just a place where one can fight Zombies!!! and retrieve tokens.