Mr. Bemis and a post-apocalyptic Earth

What should people fear the most in a post-apocalyptic world?

In a post-apocalyptic situation, people should fear lack of food, water, shelter, medical attention, bandits, and zombies. In the case of Henry Bemis, he is lucky enough to be supplied with enough food to last him a lifetime. Although this may not be true, as in the case of a bomb explosion, food and nourishment are likely to be obliterated. The survivors of a bomb detonation powerful to destroy everything on Earth were actually happen, it is extremely unlikely that one would be able to find anything to sustain life. Henry also finds that he can smoke all the cigarettes that he wants, but when he would eventually suffer from lung cancer, there would be no doctors (probably) to help him. Because there would be a lack of people with medical knowledge, even a scratch could prove fatal if unattended. Furthermore, any apocalypse survivors with health issues would not last long due to the fact that they cannot get treatment for their ailments. In the case that the world does go -kaboom!- and there are survivors they should be afraid that they do not have the means to feed or hydrate themselves, and they may die without medial assistance or a group of bandits aren't being too nice.