I have been noticing recently that my painkillers do little to help with my PN but taking diazapam (a muscle relaxant similar to lorazepam) makes the pain go away completely. My theory is that a good deal of my pain is related to muscle tension which may be what you are experiencing as well.

Unfortunately those drugs are not good to take on a regular basis. I used to be on Lorazepam for general anxiety and my doctor told me it was ok to take up to three times a day. She however did not warn me that your body quickly builds up a tolerance and I got to the point where I would have sever panic attacks if I didn't take the medication. I ended up going though a very unpleasant withdrawal when I accidentally misplaced my meds after moving to a new apartment.

I wouldn't try using Lorazepam daily as a pain killer but it may be helpful once in awhile if the pain keeps you from sleeping well. I would also suggest looking into therapeutic massage or other non drug related ways to relive muscle tension.