Dan,

Have you tried just gargling/swishing with a baking soda and water solution frequently??? I know this sounds simple, but sometimes simple is wonderful. Not sure it will help as your problem is probably arising from compromised taste buds, but it is worth a try even if it gives only temporary relief. I know the salt and baking soda water helps with a lot of mouth and throat issues during treatment...heck, you might try that even though it has salt:

1/8 tsp salt
1/4 tsp baking soda
8 oz water

Don't see that you are having chemo right now so it must be the rads to your tongue doing the damage...hope this helps, Deb