As others have said, switch flavors.  If that doesn't work, accept the fact that you have vapor's tounge and vape all of the horrible nasty 
juice you threw in a drawer since you can't taste it now.  Vapor's tounge could last a few days or a few months or a few years.  Since I only vape one flavor from one vendor, I haven't tasted my juice in over a year.  The only time I taste my juice is if I switch my flavor, but that only lasts for a few hours until my sense of taste becomes numb to it.