All of these cheer me up conciderably. This, I have found, is very important. I am lucky enough to have an extra room in my house. If someone doesn't, the bathroom or even a walk-in closet will do. Just a place where you can go, be alone, and regroup.
Exercise also does wonders.
I started out walking every evening. On rainy days I really noticed the difference, without the walk. Now, I have also added a 60-minute full body workout to my exercise regime. I feel even happier now. I also have to acknowledge my husband.