I got terribly depressed at one point in the 80s and took an overdose.
The regime I find has helped me is to get up an hour early and take St John's Wort (prescribed in Germany by doctors for depression) a B vitamin complex and L-Lysine on an empty stomach. I then go back to bed. With breakfast I take Rhodiola Rosea - I started this a few weeks ago and it has made a huge difference. Rhodiola is a shrub which acts as a serotonin reuptake inhibitor but does not have the horrible effects of the same man-made drugs. Adding this to my regime has made a truly life changing difference to me. I no longer get the 'miseries' half way through the day.
See a properly accredited naturopath for advice, and read the book "Naturally High" - I forget the author but you should be able to find it on Amazon.
Eating a starchy breakfast is also a must. Some people feel miserable simply because their poor old brain is starving. Don't worry about putting on weight if you do what is next:
gGive yourself twenty minutes of exercise that getsyou sweaty and breathless BUT NOT IN PAIN as many days of the week you can - it makes the brain manufacture happy chemicals. Another way to do this is to stand at a mirror and do grin and giggle exercises for 5 minutes - just grin and giggle at yourself for no reason and watch your face. It sounds silly, but I have found it really does affect your brain chemistry for the better, even if you are not happy when you start doing it.
Remember you ARE LOVED
I ain't never met you, maybe never will - but if I didn't care you wouldn't be reading this.
N