Look to see if your county has a future land use plan. If so, see if the re-zoning conforms to that plan.
If the re-zoning conforms to the current or future land use plan, you are likely out of luck.
If it doesn't, go to the zoning meeting, get on the list to speak and speak out against zoning outside of the County plan. Write/email your county commissioner as well as your zoning commissioner. Not sure about your county but it will likely have to pass the zoning commission and then the county commission.