Hi 4space,
You could always cure it and once the cure is in place ask the rods.
We are working with energy here, energy can and does change/move quite quickly. It is possible that the vortex is only temporary, there could be a small shift within the earth that would cause the negative vortex to no longer be a problem.
The great thing is, dowsing rods can help you to answer this question as each situation will be different.
Love,
Damien