I am really sorry to hear that
A nurse I know suffered a blood clot which has left her housebound , barely able to walk and she has put on loads of weight
She was refused the new benefit and was told to appeal but she couldn't deal with the stress , she's in a very bad way
It's a disgrace , it really is
However in your wife's case you must fight all the way and get an advocate to act on your behalf , taking it to tribunal if you have to
Riverside advice centre in Cardiff are very good , Google them or I will dig out the number for you
Take care mate