I've been taking 20mg of fluoxetine for almost 4 weeks now, but find myself in a deeper & deeper depression, together with agitation. As so many people say keep going with this drug as it only "kicks in" in around 4 weeks, that's what I've done, but now I'm getting scared that it is in fact hugely detrimental to my mental health. Has anyone else had a significantly negative effect with this drug?