Welcome, Lisa and Laurie. I know this is a terribly scary time for you, but to me it looks impressive that things are moving so quickly. As you may have read, time is of the essence, so I think your dad is in good hands as far as that goes. About food, do a search of this forum for "cookbook" and you will find a discussion of one written by a nutritionist for people with difficulty chewing and swallowing. You might want to look into the possibility of a PEG tube. Many of us were unable to swallow anything without a great deal of pain, and the tube was literally a life saver which allowed water, food, and medication to be taken easily. Do another search for "PEG" and you will find all the information you need and more. This has been much discussed, particularly by me, who was unreasonably afraid, and as it turned out, unnecessarily. Given the area involved, I would guess the docs will suggest a PEG, and you can then be up to speed about it. The next couple of months are going to be a real battle for your dad, and stressful for your family. Know that there are many people here to answer your questions and provide support.
Joanna