Lets imagine - you struggle with depression for a few years with help of SSRI pills. And you got very close to success, almost tamed your depression, came off from the pills, but suddenly something horrible happens in your life. Doesn't matter what in particular, but something really terrible and extremely painful. And you fall back into depression even deeper than you were in the beginning. You cant go back on pills, because you just got off from them. You become incredibly depressed, almost suicidal, every day memories of the event haunt you, and every your depressive mood seems justifiable. Like in the beginning you were depressed without proper reason, but now there is very proper reason, and your brain sees this event as perfect excuse to be depressed further and the negative cycle becomes very strong. How to break it?