Rhongirl, what you are experiencing is not unique to breast cancer as you can see from this discussion in the Cancer: Managing Symptoms group:
- Emotional health after cancer: How are you doing really? https://connect.mayoclinic.org/discussion/emotional-health-after-cancer/

While I moved you newest discussion to your original one:
- Emotional aftermath following breast cancer treatment https://connect.mayoclinic.org/discussion/emotional-aftermath-following-breast-cancer-treatment/
I'd like to bring @roch and @lisaok into the discussion and highlight the specific questions you asked:
"How many of you have gone through depression after the very physical trauma of cancer has passed? And what has your experience been?"