My wife damaged her coccyx from a fall. She has been suffering from degrees of pain from uncomfortable to severe. Sleeping is really a problem. Amitryptiline and currently neurontin have had a small impact on the pain.
Recently while visiting our son we discovered Lidocaine 5% patches. It comes in approximately 6" by 3" sheets. We've cut the sheets into 3 patches. Apply at night-time directly to the pain area and it has had limited but measurable effectiveness. She slept last night for the first time in several days without the patch and had a horrible night.
Lidocaine is available by prescription. I don't want this to sound like a commercial but these patches have afforded my wife some less painful sleep time. She tried the 5% last week and we know that there are also 10% available.
Lidocaine is also known as Lignocaine. It is a local anesthetic, given as an injection, or a cream or patch for applying to the skin.
More information is given on this site. Another site says, about the use of these patches for shingles (postherpetic neuralgia):
"More effective and better-tolerated therapies for PHN are greatly needed and topical lidocaine patches appear to offer a solution," Dr. Galer said. "This topical lidocaine patch, Lidoderm, for the treatment of PHN provides several distinct advantages over currently used oral agents, such as the tricyclic antidepressants, anticonvulsants and opiates. "The patch does not cause any systemic side effects, does not require dose titration and is simple to use. Due to its proven efficacy in trials and its safety profiles, topical lidocaine patches should be considered as a first-line therapy for PHN, especially for the elderly"