Well, without a detailed clinical evaluation it would be difficult to determine the cause of your symptoms. I would agree with the neurologist that the paraesthesia in the fingers and toes is unlikely to be related or due to a common cause. Possible causes that may need to be considered include stress/ anxiety, neuro-psychiatric causes, peripheral neuropathy, micronutrient deficiencies, infections/ inflammations, hormonal/ endocrine issues, heavy metal poisoning etc. Very mild/ early changes may or may not show up on the NCS/ EMG. You may consider a detailed evaluation by an internist or a neurologist for an accurate diagnosis and appropriate management.
Hope this is helpful.