I think, it is because of the some type of specific situation. When there is not much change in situation and think that it is taking a long time to change that situation, that will worse the situation. But many things didn't chabe fast, so people are long term low situation. Every one had these types of situation, ya but every time they are painful and difficult. So, only thing is to have patience and wait for the change. But some changes are worse than before, so, that makes situation more difficult again. Probably, you understand what I am trying to say. But having better sleep, thinking really positive and atleast explore internet and try to watch some funny things will just help little bit. The thing is someone had to understand what it is bugging but still many times you know what is making you low but you can't do anything except looking or wait for the right time.