Hypoglossal nerve

My husband has been for 8 week check up on his p16  carcinoma  .he originally had 6 weeks chemo and 35 radiation ,he was on fortisips through peg since. One of them that way and drinking them normally. The problem now is  he is slurring again a lot and struggling eating seems to have gone backwards.the oncologist has taken a look and said he has Hypoglossal nerve palsy  .he has been called back in for another mri today .has anybody else expirenced this problem through treatment of base tongue cancer