Im trying to find a solution, need help desperately...?

I noticed the change in my mental state since Katrina changed our lives forever. In a way I feel that it was a blessing because it showed me many flaws within myself and that I needed change. But some things began to go terribly wrong. I began to close up like a hermit crab. I stayed to myself, and felt like there was no one to talk to. On the outside I pretended to be my happy, sociable self but on the inside I began to wilt. Later on I began to suffer from off and on cycles of depression, and paranoia. Now I just gave up on a lot of my dreams, and sometimes I feel hopeless. And trust me I try to pick myself up, its just it feels like whats happening to me is out of my control. What could it be, whats happening to me?