I've been going thru this as well...vaping 3 weeks now. I've read a bunch of threads about this and other related stuff, so let me impart some knowledge I've learned from others.
Stronger flavors can work, as others have said. But a good thing to look at is your nose and sinuses actually. If your nose/sinus is clogged, this will effect your taste. Google "nasal irrigation" and try that.
Drink a lot of water. If your mouth is dry you won't taste things as well. You should be drinking a lot of water anyways if you are vaping.
Buy a tongue scraper. You can find them at any grocery/walmart/drug store. Brushing your tongue is not the same as scraping it.
If you are vaping a heavy PG juice, try one that's heavy in VG (or vice versa).
Drink a mouthful of fruit juice. I have a carton of fruit punch in the fridge and take a mouthful and swish it around. It cleanses your mouth, which is good for removing a strong flavor and might help as well.
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Also, I just went thru 3 days or so of really BAD taste and then my tongue hurting. This stuff can apply as well, but I post this in case you experience this too.....
If your tongue is hurting, it's most likely nicotine level. Lower your level, maybe even down to 0. A day of vaping just some flavored VG helped take care of this for me.
Vary the placement of your PV in your mouth. When I started I had a tendency to vape just straight over the middle of my tongue.....move it to one side or the other and mix it up. Vaping right over the same area of your tongue can irritate it.
Mix 1 cup water with 1tablespoon baking soda. If your tongue is hurting, it's also caused by the acidity in your mouth. Use this mix like a mouthwash and it will help relieve the pain.
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Best of all: Know you are not alone and this happens to a lot of us. And it *will* pass. It definitely sucks big time when it does, but don't give up and try to get through it. If anything, when it does pass, you'll appreciate how well everything tastes even more.