Lack of focus

Lately every time I go to write about anything I get writers block. I can't seem to focus on anything really anymore. It is really hard for me to stay focused on one specific thing for any length of time anymore. I don't know what is going on but, it is like my mind is just messing with me. It is really hard to explain how I am feeling. And now writing has the opposite effect on me from what it used to. Writing always makes me think about my past now and makes me sad/down. I know that it is in the past but everything seems to have a bad memory attached to it. But that is just life right? We tend to remember the bad thoughts, memories more than the good ones. I think that I need to move away from here and start over new...