Oh Yes. Your taste is going to change for quite some time. You will have to try anything and everything that you can tolerate. Your taste will probably go away completely soon or like many of us, just be left with a metal taste for a while.
I hope a feeding tube or port has been offered. Feeding tube can be a bit annoying but is far less invasive that a port. With tongue radiation your days of eating might be limited. No worries however, taste does return ten to thirty days after radiation ends in most cases.
Milkshakes with protein powder mixed in might be something to try. Don't worry about a balanced diet at this point. Calories and protein are priority now. Not medical advice, just my opinion.
Sorry you are going through this during the holidays.