I understand that post treatment we are all potentially open to anxiety and depression as we transition from "treatment normal" to "everyday normal". My oncologist went through this with me at the beginning and said he would follow up with me post radiation. I've still got 4 chemos and the rads so I will have to wait and see.
I do remember reading that another pink chick talking about it. Roslyn Mitchell is her name. Perhaps you can link with her and ask her how she is dealing with it.
Be gentle on yourself. Take care.