You are probably above the range for LASIK. With very high corrections, too much corneal tissue needs to be removed to decrease the myopia, and there can be complications from this. Also, you need to be evaluated for keratoconus, which can cause high myopia and high degrees of corneal curvature.
Regardless of your cornea curvature, most surgeons will not perform LASIK above -10.0 these days. Often, a different surgery, such as ICL (Implantable Contact Lens) would be an option for you, because it does not involve the cornea in any way. More info is available at http://www.2020vision.com/procedures_ICL.html