I know this thread is a bit old now but as a new member I've only just found it.
Amy has been having these symptoms for quite some time and I'm actually relieved to see that she's not alone with these symptoms.
She also has rumbling tummies, wanders around clearly uncomfortable, and sometimes her tummy appears swollen,but her motions are fine, and she has no sickness. I used to give her a tiny bit of Milk of Magnesia and this settled her after about an hour.This would happen every 2 weeks.
For about six weeks though I have been giving her a sensitive tummy tinned diet by Royale Canin from the vet, and (touch wood) since then she has had no more rumbling tummies.