The "fear of death" is not abnormal rather it be an adult or child, and at 7 years old to be "wiggly" or active I wouldn't be ready to say the child is hyperactive. If you see his grades at school are suffering and/or his teachers complain about his behavior is not acceptable or he is constantly daydreaming, I wouldn't worry about it. If you are concerned my best guess would be to have him evaluated by a child psychologist or psychiatrist if warranted. My best advice is to "relax" and try not to read into things unless he has trouble with school and/or friends
Take care,
"darkeyes"