You should give yourself more time and less stress. When the swelling go down, you will regain mobility of your tongue.

Try to eat often in small amount, coz that's what my mother do now.
I have make puree creamy soup for my mother. And I usually put a lot of grains, and tofu into the soup, and then puree them with a high speed blender, it helps to make you feel full for a longer period of time.