Depression is very difficult to deal with. I am so sorry you are feeling this way.
I found a book once that I often return to. It is an all natural way to help heal depression. I've returned to it often. It describes in scientific detail how the foods we eat often can cause us to feel worse. Then it goes into more scientific detail on how to fix it. I love this book and when I followed it I felt calm and sane. Now, whenever I start feeling a little out of control I follow the principles in the book and feel a lot better. Basic outline is as follows:
1. Eat only 3 meals a day. These meals should have at least 20 grams of protein in them. No sugar, no diet soda, no anything between meals. (If you need sugar or soda have it with your meal.)
2. Eat a potato after your third meal about an hour before bed. You must leave the skin on the potato. You can put butter, salt, etc. But, you cannot have any protein with the potato. You can fry it, mash it, bake it, etc.
3. Make the switch to whole grains.
4. Eventually cut out sugar and soda.
5. I think you should walk 30 minutes a day, but I can't remember if that is a step or not. I'm planning on rereading it again soon.
Anyway, if it sounds interesting to you definately get the book from your library. The science that went into the research is really very amazing. This book has changed my life and helps me feel in control.