First you must know what it is that is making you un-happy, then you must ask what can I do to change my situation.I've battled with depression for many years, depression can be either mild, moderate or severe. With mild depression all you need is to eat well, exercise and treat yourself with nights out. With moderate depression it helps if you take some herbal remedy from a health store that deal with low mood. Now with severe depression its you against the devil, believe me you need to be tough, I'd seek professional help, definitely seek help from family and friends and take medication if the doc recommends.
I'm in a blah slump.