Failed?
Not possible with depression. Unless diabetes is failure or a broken leg then I stand corrected. Illness is illness is illness, except from my experience depression has been worse than the cancer.

Flare-ups which are frustrating, painful even, but remember your post gave a lot of us comfort and hope for our own healing.
And if you did it once you can do it again. Read you post and remember.

Do not forget to get help from your pdoc or doctor.

And there are many more people that can help you at PC.