I'm lucky enough to be one of the 5.7 million Americans living with bipolar disorder. Although it is usually well controlled by medications and lifestyle choices, I do cycle through episodes of mania and depression from time to time.
When the depression hits, I spend a lot of time thinking about everything wrong with my life. I've found that the best way to deal with these thoughts is to force myself to change focus and acknowledge everything that's right in my life. I call this my gratitude list, and I keep it right in front of my computer in my workspace. It brings me comfort during hectic days or days when I feel a little down.
If I'm having a bad day, I also challenge myself to add at least one new item to my gratitude list. It may take some creative thinking, but I'm always able to come up with something.