I have been experiencing waxing and waning large fiber sensory nerve damage resulting in prolonged latencies in nearly all sensory nerves. I have also had many symptoms of autonomic dysfunction including orthostatic dizziness, vagus nerve malfunction, and abnormal heart beats (tacchycardia), and mucus in my lungs in the morning. Based on my symptoms and a prolonged latency in a motor nerve, I believe my motor nerves are also affected.
What could cause small fiber and large fiber neuropathy in sensory, motor, and autonomic nerves?
and how concerned should I be about the symptoms relating to my heart?