Hi Spimo,
I have read about stenosis and some of the problems CAN include cognitive dysfunctions (memory loss, difficulty with words, etc.) This could be directly related to poor nerve transmission, and some people are prescribed Neurontin or other stuff. Also... with alot of pain and the stress of a chronic disorder can come depression. That also messes with your ability to concentrate and remember. Discuss your concerns with your doctor, ok? They are legitimate.
Good Luck!!
Niki47