Margaret,
please listen to these guys. I was quite lucky re side effects during radiation. Right now (I week after end of Tx), I wished I felt as I did 2 weeks earlier.
I would suggest that it is normal for a patient to feel frustrated and sad etc during the Tx (would anything else be normal???). That does not mean that antidepressants are bad and if they help, great. On the other hand they are not candy either and the medical profession is in my opinion quite nonchalant in prescribing them. (OK I am off my soap box now).
M