To all those that are posting with depression. Take heart, with time be assured that it will pass, not necessarily permanently, but it does go in cycles (in my experience)
If you can accept your current state of mind as a phase that will pass, you are on the first step to recovering to normality. Please seek professional help, however sceptical you may be, it does help.
I had counselling many years ago, thought it was a waste of time, but, strangely, after a few weeks I was seeing life a little clearer.
Again medications can help, if you don't get on with it, talk to your doc, there are many alternatives.
I have been on fluoxetine for years now, it keeps me normal (that's debatable) most of the time, but I still have dark spells, but I now know that they will pass, some times in a day or two, sometimes it may take several weeks.
Remember you are not alone, talk about it, many people will understand how you feel. Don't ever be ashamed of depression, it is an ailment just as any physical ailment is.
Only yesterday something was said to me that sent me spiralling down, today I managed to get it into perspective and caught myself in time.