Are there any hobbies that you have done in the past that you love doing that make you happy? If so maybe get back into something you like doing. Mine is of course being a female shopping!
I have been given an "exercise" my theropist is to write in my journal
"how I felt today" and when i'm up for it "a postive thing about myself"
and it's helping because it's getting things out of my mind for me to see in the open.
Start mediation maybe? Surround yourself with your good friends. Things do eventually go on the up again, we can never always go down, even when you think we can.
And coming here has helped me alot to.