Can Lidocaine Patches Be Used Long Term for Tailbone Pain?

I bruised my tailbone and don't have the energy to do the doctor/x-ray exhausting routine. I've gotten some relief from lidocaine patches (4%). It really is torture to try and apply to my lower back area, but ... Can these lidocaine patches (12 hrs/day) be used long term? I have extreme weakness from years of CFS, so adding a doctor visit, x-rays to my routine is not possible. Please don't yell at me.