eddiecat I am so sorry to read that you have had such a bad time. Life can knock us down, again and again. I suspect most of us know what it's like to feel depressed and to realise fighting it is becoming harder and harder.
I can understand why you don't want medication. I recently weaned myself off Amitriptyline, which I have been on for years, for pain relief and migraine prevention mainly, because it was making me feel like a zombie, numb and tired. The anxiety and worry I feel now are the side-effects of being drug-free. 
Keeping busy isn't always the answer. I like all of serkeen's tips, above. There are some good ideas there. (Please post more! There are sure to be things depressed people can try.)
It might be worthwhile talking to your doctor because sometimes we cannot fight depression no matter how many diversions we try.
I have found if you embrace your feelings and explore them, being fully aware of mood changes etc, it helps. Don't see low moods as a weakness or a failing. They are moods and they will pass. (If they don't, do seek help.)
Be nice to yourself when low instead of mulling over things. For me, thinking too much is my enemy. Go and do something small for yourself - make a good coffee, have a lovely bath, put some lipstick on, sit in the garden sunshine for ten minutes, play a favourite tune. Just do a little something and tell yourself you deserve a treat.
I also write about my feelings. It helps me unload them.
I hope you are able to work through this eddiecat, and I send you lots of positive vibes through the Gransnet ether.