I’m pretty sure there could easily be a reverse placebo effect. The mind is powerful and when we take it in our mind to dislike something, that can be very powerful.
Having said that, I would like to point out that it is well known that anti-depressants change in their effects over time. They can work for a while—years, perhaps—and then stop working. Body chemistry changes over time. So it might be that the med stopped working for physiological reasons, not mental ones. Or for both reasons.
The key with drugs aimed at changing brain chemistry is to stay in touch with your psychiatrist regularly. At least twice a year. Report any changes. It may be time to change meds. You may need to come off the med. Or replace it with something (or some things) else.
It is also possible, I believe, to learn to manage your depression on your own, and to stop relying on meds. I believe in meds, but I don’t think they have to be forever. In fact, my goal is to get off them entirely, at some point. I have recently removed one med. I have been experiencing some small ups and downs, but I believe I can remain relatively stable, and respond fairly effectively to life’s changes.
I wish you the best in achieving your mental health goals. Just remember, mental health is a serious thing. 20% of people with bipolar disorder die of the condition. One in five. That is nothing to sneeze at and a mortality rate like that should give everyone with the condition pause.
Depression is considered, by some professionals, to be the same as bipolar, only without the highs. This is not something to mess with lightly. Watch yourself carefully. If you are getting in too deep and losing perspective and believing this is the end, get your ass to a professional ASAP!!!
By the way, anti-depressants can be permanent. It all depends on the person. Depression is a chronic ailment. It always needs treatment, whether by meds or by psychological tools. Anti-depressants are meant to help, for as long as they are helpful. There is no “use by” date for anti-depressants.