While it is important to be prepared for things that might occur, it is equally important to not obsess over these things. Keep things in perspective; if you can live your life prepared but also happy, healthy, and with peace of mind then you are way ahead of most folks.
Your health is of the utmost importance. Without good health, everything else is secondary. Work on doing all you can to be healthy, happy, develop peace of mind, and have a positive outlook on life. Everything else will then fall into place and you will be better prepared to handle a man-made or natural disaster if an when it happens.
You can take a look at some of my apocalyptic, zombie, or horror fiction books on the left side of my blog page by clicking on the book cover images. If they interest you then I hope you will consider purchasing a copy