I'm certainly no authority when it comes to clinical depression, and haven't had any experience with anti-depressants, but I suspect that there are a lot of people here on these forums that have been at a low point like this, and recognize it as a tipping point towards a powerful transformation. A natural way of finding peace through suffering, and not necessarily something to be treated with drugs.
I'm pretty sure that had I gone to a psychiatrist when I hit bottom a few years ago, I would have been put on a high dose of anti-depressants. And knowing what I know now, that hitting rock bottom like that is simply an opportunity for transformation, I am very glad that I got to go through the natural process of suffering.
I do think that serious suicidal tendencies warrant an immediate visit to a psychiatric professional or similar, but even then I would ask the doctor for an alternative to medication. At least a form of treatment that involved a good balance of medication and spiritual consultation.