Check your real estate sales contract. It's possible that there is a clause requiring the previous owner to inform prospective buyers (you) about certain issues with the home -- example, lead paint, underground oil tank, asbestos (varies by state law).
It's a reach as it likely doesn't cover actions that are happening on an adjoining parcel but if there is any kind of clause that applies to changes in zoning or land use it might be worth pursuing an argument that the previous owner knew of an issue but failed to disclose it prior to the sale. You might be able to unwind the home sale.
I suspect that previous owner had following the permitting process/ zoning necessary for the fracking to be legal and knew it was coming so they sold and dumped the problem in your lap. Very bad karma, IMHO. I'm sorry it happened to you.
If that doesn't help, you should review ALL the permits issued to the fracking company. There will likely be limits on their operations and how they can behave on the site. At the very least you can monitor their actions and make sure they stay within the limits of their permits. Call your county's land use/ planning department to start with. Your state agency that deals with mines and minerals will also likely be involved.
Good luck.