Positive thinking only works when there is something positive in your life. If there is just negative then there is just negative thinking. Nothing happening in your life is also negative. Sometimes two negative things equate a positive like in mathematics but sometimes you just decreasing negatively in thought and life. There is a positive increase but how long that lasts is how long you want it to. Unlike mathematics you can control what is positive in what is negative. The only problem is that negative things engulf the positive things. It just takes a inner look at one self and how one functions to find the positivity and negativity medium in life because you need both or you wouldn't be living.