I too have worked in the medical field (read: lab rat). Not going to say I'm a doctor (cause I'm not!

) but I can tell you a few things that can happen to lose sense of taste:
Dehydration is one of them. This makes tastebuds kind of *run away* and hide. Your body needs water! Not just tastebuds, but for general health.
If you are a coffee drinker: Coffee has a light oil in it. It can and will coat your tongue, and tastebuds. One cup, light coat. Two cups, oil upon oil. Three cups, another coat.
The above also goes for tea.
Creamers/Milks: All of these have oils in them too. Do you add that to your coffee? (Heavy cream makes butter.. oil/grease)
Clean your nose: sense of taste has some to do with smell. (Actually a lot) if you are uncomfortable with a neti pot (I love my neti!) Try just the edge of a wash cloth and clean out just your nasal passage.
Vaping can leave it fairly dry in there. Also, those of you who inhale through your mouth, and blow vapor out of your nose: There are oils in some of those flavors. Coating.. again... the hairs in your nose and desensitizing your sense of smell.
If you're vaping something REALLY strong in flavor for a few days, it will diminish your ability to taste something more subtle. Think about something like when you eat curry chicken (or equivelant strong flavored food) ... some other things that you eat the next couple of days may seem bland.
Force yourself to take a break from the flavors.
You can overwork your tastebuds just like any other part of your body. They need a break from time to time if something is overwhelming.
Good luck, Vapers! <3