subacute degeneration of spinal cord

i was diagnosed with life long b12 deficiency in 2003 with an mcv of 113 and mri scan of the brain showing white mater changes, csf had auto antibodies ,had all the symptoms tierd, forgetfullness, confusion,brainfog, sever fatique, swollen tongue, stocking and glove numbness and pins and needles,general very ill health .....it was discovered i had this anemia since 1995......i was stared on loading doses followed by 8 weekly injections since ...although i have had some improvment most of the syptoms (symptoms) are more pronunced and have over the last year noticed muscle weekness in legs with burning soles of feet,i just cannot function normaly on a day to day basis . I had a repeat mri in 2005 which showed no improvment of lesions.....i have recently heard about subacute degeneration of the spinal cord but cannot get my doctor to listen .......could this be a possibility and if so how do i get sombody to listen .....many thanks