D.

You have deteriorated beyond what words can describe, but you haven't failed (which would be an "F") since you're alive still. 

If you've been like this a while, you should definitely be in therapy and/or on medication.  If looking up a shrink and setting an appointment seems like too much, try to get a good friend to do it for you.  Things are not going to just get better all at once, but it can happen - slowly.

Here are a few selected pages on the Net about depression:

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Just for the heck of it, also try our e-pharm.