1) you need to check the archives for info on tetanus. there are a couple of excellent threads that you really need to go through
2) no, pertussis causes pertussis. However, the shot, like the flu shot, isn't very effective. Again, check the archives for more info.
3) Yes, you are correct about Hep B
4) I can't sum it all up in one post. There's so much you can learn about the brain, the immune system and vaccines on this board by what's already been...