Mine's rumbling too, but I think it's becuase I'm getting back into ketosis after ruining it with my picking habit- I hope so! LOL!
It only grumbles like yours a few hours after some senna tablets!
My stomach doesn't rumble so much now. When it did I used to imagine it burning away all that fat too. Look at it as a positive thing. It's also teaching us that feeling of being empty, which I can't ever remember having before LT.