My Loss of faith has caused severe depression

[Angrboda]

Yes, follow Rhythm.

For better or worse, I think this "staring into the abyss" phenomena is something that a lot of people who've recently lost their faith go through. And, I think, though I have no numbers, that most people successfully resolve it over the course of time. I think part of it is simply a grief reaction: you've lost something that gave your life meaning; you'll likely grieve just as if you lost a son, or a close friend. Part of it, too, I think likely has to do with the philosophical questions and the conventional answers to them. The philosophy, depending on the person, might help them find their way through to a successful resolution; other people, the questions and answers might well help to keep them stuck in depression and grieving. What each person finds satisfying answers to the philosophical questions differ for everyone, so I'm not going to suggest my views. I will simply suggest that, for better or worse, this is a phase that many people go through after losing their faith. It's not going to go away by itself: you'll still have to grapple with the issues personally. But for most people, it resolves itself over time, though not without considerable discomfort and anxiety in the process. I suggest simply accepting it as normal, and, also realizing that what you are feeling now is likely not permanent, and will improve with time.

I guess that's the best I have to offer. I lost my faith very early and don't remember what I felt, and am now deeply religious. I remember discovering Sartre in high school, and I think a lot of existentialists go through a similar phase, but I didn't find Sartre's vision at all bleak; I'm not sure that's true of everyone. How well the philosophical/pragmatic answers solve the existential questions differ from person to person, and so will be very individual.

As noted, I think much of it is a grief reaction, and things which help in resolving grief are likely to be effective. (From staying active and social, to seeking out support, whether in the form of support groups, or in new, social hobbies. [And there's nothing wrong with remaining active in your previous religious traditions and community; though some may not agree with me.] I'm sure there's more information on how to work through grief on the web, as well as plenty of misinformation. [I'd stick to medical sites first])

Best of luck.