I had an LD once in which I could hardly move. It felt like I weighed ten times as much as I really do, and everything was blurry, I couldn't see a thing. So I said to myself "This is my dream and I'm in control of my own dreams!" It didn't work, but then I remembered that you really have to believe what you say. I tried again, and it worked. My body felt lighter, and my vision sharpened. I started examining the carpet, and the dream became even more clearer.

I don't know if this helps much. Make sure to read the tutorials on dream control.