You need to open up your guitar and loosen up the tension on your tremolo springs. I went through the same problem with my DK2. I think my problem was caused by changing the thickness of strings that I was using. I've always used Ernie ball 9's and I switched to the DR dimebag signature strings. Which were thicker than the Ernie ball's. At first I liked the thicker coated strings but I turned out going back to normal un coated 9's (the thick bottom strings are great for fast rhythm playing so I get the Ernie ball hybrids now) Anyhow, after
Putting thicker strings on my guitar, they were putting more stress on my neck and when I tried to tune my guitar to standard E the bridge was almost perpendicular to the body. I temporarily solved the problem by tuning down to drop C. I eventually got tired of my bassist bitching about being in E so I opened up the guitar and adjusted the springs. All my guitars have floating bridges and I almost never use the tremolo bars. In fact, I was practicing my dimebag squeals today and my D string snaps on me.