Hi,
Thank you for posting your query.
I have noted your symptoms and it is unfortunate that you have been diagnosed with 
amyloidosis (same as your brother). This is because it is a genetic disease.
As you mentioned, the best treatment for you would be heart and 
liver transplantation (as your brother). You can keep in touch with the transplant surgeons for the same.
For 
neuropathic pain, you could use 
pregabalin capsules.
I hope my reply has helped you.
I would be pleased to answer, if you have any follow up queries or if you require any further information.     
Best wishes,
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad,
For DIRECT QUERY to me:  http://bit.ly/Dr-Sudhir-kumar 
My blog: http://bestneurodoctor.blogspot.com/