Referring to recent posts on people feeling as if on a roller coaster....up one week and down the next. Seems to me that this is the normality for many people....it's how a depressed person responds to that up-and-downness that marks him/her out.
My own experience of dealing with depression is that often small steps are the catalyst for longer term changes. Small steps are easier to contemplate.
Example: I said out loud some years ago to my family that one day I'd run the London Marathon. They fell about laughing. Next day I put on the trainers I wore to do the decorating, some old trackies and ran round the block - about 7 mins. Had to lie down for an hour. Two days later I went out again and ran the same distance...same result. Two days later did the same and found just a bit easier. So ran a bit further. Carried on and built up the distances over a long period but in small increments. That was 12 years ago. Now run about 20 miles a week and it's become habitual.
...And I'm no saint (ask my wife....). I still have good days and bad. I feel lost sometimes and completely alone.
I just plodded on, adding a bit here and a bit there. But each advance was a little victory for me. Now I seem to accept the mood swings as normal and deal with them as such. I know they'll pass. So I wait to feel better in the certain knowledge that I'm not unusual.
Some great practical advice on there . The fella who started Ultra Marathons started in a very similar way.