First of all, honor that feeling down or "funked out" is not something to berate yourself about. Everyone feels kind of blue every now and then. You cannot appreciate your joyful state unless you experience some darker times. Honoring that you feel a little low, and understanding that the feeling won't last forever, is important.
Sitting around and feeling sorry for yourself only works for a short while. Eventually it is time to do something about it. Picking yourself up and going for a walk can do wonders. While walking, allow yourself to take in the scenery, foliage, birds, or squirrels. If landscaping is something you are interested in, notice what others have done with their yards. Pulling the focus away from your funk is an excellent way to "trick" the mind into thinking about something else.
Walking, or any other physical activity, is a great way to get some endorphins to kick in and help you feel better. If you are bound to bedrest, you can get your endorphins to work their magic in another way. Switch the channel from talk shows and news and find re-runs of some of the old sit-coms. An "I Love Lucy" marathon can snap anyone out of feeling blue. Pick a comedy on the movie channel to keep you busy, and make a point to surround yourself with laughs instead of lulls.
Call a friend and let them know that you are feeling funky, and allow them to come over for a visit or a meal. Often when someone is in a funk, they feel very alone. By surrounding yourself with loved ones and friends, you will be reassured that the way you feel matters, and that help is on the way.
Writing your feelings down on paper is a great way to determine and address the cause of your funk. Place your pen on the paper and write whatever comes into your head. Let it go, and let it flow. When you are done, read what you wrote. This will give you an insight into the cause of your funk, and the ability to release it. It is not necessary to keep what you wrote. In fact, writing it, reading it, burning it, and washing it away, is an excellent way to pull yourself out of your funk and getting on with your life.