Hi @macjean and welcome to Mayo Clinic Connect. I am happy to help lay out a few different scenarios that may happen depending on the course of treatment/ second opinion status. Mayo is a destination medical center that handles complex care cases, however, not all cases require that amount of integration with other specialties. If you are seeking a second opinion, they will most likely set you up with only the specialty that you are seeking that second opinion in. I can with confidence tell you that they are one of the largest and most comprehensive neurological practices in the world and they are aware of autoimmune disorders that cause neuropathy like Sjogren's syndrome, lupus, rheumatoid arthritis, Guillain-Barre syndrome, chronic inflammatory demyelinating polyneuropathy and vasculitis. If you mention to your physician that you were told it could stem from an endocrine/autoimmune disorder, I am sure they would be happy to help with that and may suggest further testing or appts depending on your medical records. Off hand, I know that the neurologists Dr. Feyissa specializes in autoimmune related diseases and Dr. Freeman and Dr. Kennelly specialize in neuropathies.
Tell me, Macjean, did you mention this to the appointment specialist about it possibly stemming from an endocrine problem before her telling you they would only make the first appointment?