If you choose to stop taking an anti-depressant, please be careful and consult a physician. If you don't taper off the drugs, you can feel some really nasty effects. This seems to be particularly problematic with Cymbalta. https://en.wikipedia.org/wiki/Antidepressant_discontinuation...
You bring up an important point. If you STOP taking an SSRI, you will feel depressed, because your serotonin levels will drop. What's happening is that the SSRI has been fighting your body, pushing up your serotonin levels, and your body has been fighting back. When the SSRI is cut off, your body's fight continues for a while, pushing levels down. Often patients feel suicidal at this point.
Healy and Whittaker point out that the clinical studies initially used to justify the use of SSRIs cleverly took advantage of this effect. Patients on SSRIs were compared to those who had just been cut off the drug. Of course the latter group, perversely included as "placebo", fared worse than the ones taking the drug.
