When you're ready, get out there and socialize. You might consider vitamins and supplements to help you keep well-nourished. You may want to take certain supplements like St. John's Wort that help to fight depression. Often your doctor can switch the medication to something less bothersome. If nothing else, walk - everywhere you can.
Exercise causes the brain to release endorphins that, wonderfully enough, elevate the mood.
Often psychiatrists recommend adding exercise to the treatment of depressed patients, for that very reason. Park the car far away. Go on a hike. It's hard to stay sad when you're helping others. Getting out there and pitching in can help you as much as it helps the people you're helping.