Sorry, I posted this twice, but someone else may read it here and have some ideas or comments...if we share what works for us..together we may find a solution to this problem....
Sorry I cant really be of much help...struggling with the same issues...sometimes negativity just takes over and it defies logic. But have you looked at the learning path
www.clinical-depression.co.uk ? It looks really good, I cant really say if it it works yet cos I am just beginning with it but I feel quite hopeful - it looks like a very diferent and a more positive appraoch than a lot of other stuff out there. Maybe someone with more experience than me will give you some advice. Good luck.
OH...here are some things that I have tried recently ...they have been helpful to some extent.
I compare the times I am feeling down with the times I am feeling up. And then think through the differences, why I am feeling good at that time, for example. And quite often I find that my circumstances at both times are just the same, the only thing that is different is my perception of my situation. In many cases this is what I have found. Once I realized that I find it helpful to remind myself when I was feeling down.
The other thing I have been trying recently which has also been surprisingly helpful - has been to make a note of my mood in my diary. I score my mood (10 is normal and 1 ..well the other end) in say in the morning and and the evening. If my mood changes I try to think why it has changed, what triggered it, what were the circumstances, and I make a small note. I have found the results quite surprising. It is amazing what litttle things send me down into a depressed mood. Then it is interesting to look back through my diary over several weeks and see a pattern as to when I go up and when I down.......try it, I would be interested to know if it works for you. I find these things are providing me with insights as to how my depression works ...I still look forward to finding the secret of totally ending it though..