I usually have 3-5 flavors going to alternate with, trying to avoid vaper's tongue. It happens from time to time. Stay hydrated, keep water or something nearby always. Like Aaron said, brush your tongue when you brush your teeth, if you aren't already.
I've tried many or people's tricks when I've had it. Usually, time works best. SO frustrating, but you'll get your taste back.
Oh! This does help me, if I do it on a regular basis..... saline nasal spray, like Ocean Nasal Spray. I use that frequently, to keep my sinuses hydrated.
Good luck! I know how horrible it is to not be able to taste your fave.