Indoor is good too, but with spring upon us outdoor is best. Growing plants can give you a new appreciation for life and a chance to bury your unhappiness. Those who have been through a trauma such as a loss of a loved one often find that writing in a diary can be very helpful. At least once a day, write down your innermost feelings, don't censor yourself, let it all out on paper. This is said to really help in the healing process.
Exercise is good for everything.
A good brisk walk can make you feel good about yourself almost immediately. Take six apples, remove core, skin and seeds. Slice the apples into small slices and put them in a pot, add 2 cups of honey. Cook these over low heat til it has a syrupy consistency. Let cool, then put in a jar and refrigerate.