Hi, Nelly. I have a TENS, and it is helpful. I was diagnosed with Complex Regional Pain Syndrome now and was given Memantine to try to help with the ongoing nerve pain. I think it is being used to try to "reset" things. I'm also taking:

Provigil - 200 mg (morning and noon)
Keppra - 1000 mg 3x daily
Tegretal - 200 mg 3x daily
Soma - 350 mg 4x daily

and some other things...haha, but these are the main ones to help with pain