My husband has had some brief episodes of anxiety and depression through out the course of his treatment. These reactions seem pretty normal to me given the circumstances!
Some of these reactions are due to the situation but I noticed that some of the medications he was on to treat side effects of the chemo may have also contributed to his symptoms. Always discuss these types of symptoms with your Dr.

Base of tongue spread to 2 lymph nodes.stg?? Dx 5/5/09 peg
Tx started with 35 rad, 7 weeks cisplatin, 2 weeks 5-fu.
completed second course of tx with reduced dose of cisplatin &
5-fu. All clear
Post radiation swallowing difficulties 12 years later