arg i apologize for this in advance but when i read your diet it 'touched a nerve'
my spinal cord damage is improved visibly on mri after not only b-complex supplementation but many other components - most fundamentally, a radical diet shift from 15 yrs strict vegan to 2+ years and counting biologically appropriate, ie the self-titled 'biodiversity diet'.
IMHO veggies and rice are not going to cut it, quite frankly, even added b supplements. by the way the b-complex megadosing protocol - one of the other components was notably a high protein intake for a few days, including 2-3 eggs per day.
i had to learn the hard way on veganism, but at the end of the day: been there, done that, paid the price.
in a typical day (now) i am aware of sensory loss and some other minor issues (not ON though). usually i don't feel the brain lesions.
be aware that b12 and the b-complex are the tip of a very large nutritional iceberg for vegetarians and vegans. i'm almost 3 years into the biologically appropriate mode and still trying to puzzle out the details of what i've done to myself over the previous decade and more.
mind you at this stage i can breathe normally, i'm not drowning (as much) in my own spit, i can feel the ground under my feet other than by bone vibrations, i can type, and hold objects, and play guitar again, and i don't have to pay someone else to wash my hair any more.
okay everyone how was that for a jimmy-style rant
hope that helps v