This exactly. Cold turkey is dangerous in this case, not only because of the sudden change in your brain activity - which induces your undesirable thoughts. More importantly, it can upset the balance of things in such a way that in the future you might have to take more anti-depressants to get the same results. Another danger is that you simply get stuck in this mood. This means that no amount of anti-depressants will get you back in shape. It doesn't always happen, but there's no point in risking it. Think of your brain as consisting of three types of hormones. The three of those normally keep each other in check. The balance was probably messed up in your case to begin with. Chemical agents attempt to restore that balance. And you took an element away in an unnatural manner. The body can not adapt quickly enough and does weird things. Ease off if you can, and go and consult your psychiatrist for the correct medication. Quickly.