Your husband's situation w/ the nodes and base of tongue cancer are very similar to my husband's...and a frequent poster on here, DavidCPA. David's going to ask you if your husband's biopsy was sent for an
HPV test. Some base of tongue and tonsil cancers have been linked to
HPV and it appears that the success rate for these types of cancers is quite good.
The next half of his treatment and the following two weeks after treatment are going to be tough if he is having discomfort already. But, you'll get through it. Just make sure he stays hydrated and gets enough calories and protein. And, if he is not on pain medication tell the doctor's he is hurting when you go for radiation tomorrow.
And, keep posting here...there are many here who will help you and your husband get through this!