--that you probably have both large and small-fiber disruption, given your poor nutritional status. But the testing you may have received may have only revealed the grosser large-fiber disruption; small-fiber is harder to definitively diagnose (the current gold standard is skin biopsy to measure intrepidermal nerve fiber density and condition).

Large fiber neuropathy can be found using more standard nerve conduction/EMG tests, and since abnormal readings on these usually mean fairly extensive and unequivocal damage, I'd say you're pretty compromised.

AND--what doses of supplements are you taking? It's pretty standard post-bariatiric surgery that there be massive supplementation, as most of the area from which you could absorb nutrients is gone. I would think, for example, you should be on at least 5000mcg/day of B12, to allow passive absorption of 1-2% of that amount. I'd also think you should be supplementing calcium, magnesium, the other B-vitamins, D (probably at least 5000IU/day if you don't get out in the sun much) and definitely essential fatty acids . . .