What nerve blocks/anesthetic blocks work the best for bilateral leg neuropathic pain?

Depends...: On the nerves that are irritated and the location of your pain. If pain is widespread all over legs and reaches your toes, a caudal epidural steroid injection with a large volume to cover a large area of spread in lumbar spine might help. If symptoms are more localized, a more selective nerve root injection may be helpful.

Depends: on where the problem lies... If epidural steroid injections are not helpful, then injections like sympathetic blocks can be helpful. Other options include spinal cord stimulation as well.

Lumbar blocks: Lumbar sympathetic blocks, root blocks can work. If they don't spinal cord stimulation is an option