So if they do not work well at the elbow, place them at the neck location...as illustrated on the link I gave.

The ganglions are along the spine. If you have issues on R and L, place the lidoderm over the neck area, horizontally, to hit both R and L ganglions, along the lower neck area... the link shows about where they are. Lidoderms don't usually work on end type pain. They work better at the spinal level. In ganglioneuritis the pain is being generated at the spine, not lower down.

If they do not work along the cervical spine...I'd suspect Thoracic Outlet syndrome:
http://neurotalk.psychcentral.com/forum24.html

This is generated in the brachial plexus either nerve compression and/or vascular blockages (clots or compressions) deep in the chest.