Yes, I agree.I have heard about Autism too. But some kids with autism are very much interested in doing a specific activity. So, atleast they are blessed in that way.
Death.... There is no pain after death. Feeling the pain mentally and physically that we are suffering with a very dreadful disease is the horrible state.
I do agree with the many of the mentioned diseases. Here are the worst diseases in my view:
HIV
CANCER
BRAIN HEMORRHAGE
PARALYSIS
HEART PROBLEMS.