All I can do is echo everything said by others. In my case the amyloidosis has attacked my kidneys, and I am now on dialysis. Cardiac amyloidosis presents a different set of problems and I cannot comment on that, having no experience, but the NAC are indeed wonderful, and I am also well supported by the Haematology and Renal units at our local Derby Royal Hospital.
My wife has been an absolute saint. Apart from the fact that I have to do dialysis 3 times a day, which is not as bad as it sounds, my biggest problem is lack of energy. I cannot do much around the house, and have to be careful not to attempt too much each day or I just get exhausted. For instance, I usually walk the dog, and can manage about a 1-mile walk, but if I have other plans for the day, e.g. a major supermarket shop, a trip to a football match or an evening out (even for something as physically undemanding as an evening playng bridge), then my wife has to do the dog-walking. On top of that, she does most of the housework as even a quick run round with the Hoover would be beyond me, and she does her best with the garden too, and looks after her mother who lives close by and is not in the best of health, and she holds down a part-time job. I am a very lucky man.
But as others have said, do not be too scared by anything you read on the internet, and you can rely on the NAC to be absolutely wonderful. My 6-monthly visits to the Royal Free Hospital actually feel like a nice little 2-day holiday in Hampstead. The Premier Inn staff must be used to having RFH patients staying with them, because they will treat you very well. And I love the chance to eat at Carluccio's, up the hill from the hotel, which is a cut above the usual Italian chain restaurants. We also try to get to the Everyman Cinema if there is anything decent showing. Do not despair, it can all be quite fun!