Hey Emily, my name is Jennifer. I am currently being tested for Amyloidosis which can cause the symptoms you mentioned. Evidently, Amyloid is rare but under diagnosed. Typically not diagnosed until age 30 and above. Other symptoms/diagnosis for amyloid include carpal tunnel syndrome, peripheral neuropathy, autonomic dysfunction, heart arrhythmias, low voltage on EKG, diastolic dysfunction, kidney problems, liver/spleen enlargement, diarrhea/GI symptoms, etc. Basically it can affect the nerves. skin, Gi tract, liver, spleen, heart. All of these symptoms can occur years prior to diagnosis.