Relax. We are still a few thousand years from passing through the galactic plane, and when we do, disaster is by no means guaranteed.
You might want to know how passing through the GP increases the chance of a major event on earth.
1. The galactic plane has a higher density of stars, dust and gas. These may disrupt some of the comets in the Oort Cloud, sending them into the inner solar system. This increases the chance that one of them will impact the earth, but the odds are still several million to one, that an impact will occur in any given year.
2. The gas and dust may block enough sunlight to cool the earth slightly, perhaps causing an ice age in the far northern and southern areas closer to the poles.
3. Being nearer other stars, increases the risk of being adversely affected by a local nova or supernova. One may be responsible for the disappearance of the wooly mammoths, rhinoceroses, and horses in North America, about 10,000 BCE.
Now, if you insist on worrying about catastrophes in the near future, worry about global warming, global climate change, and the end of cheap oil. The processes are already in motion, and people are doing much to little to avert certain catastrophe. In part, this is because they are too busy worrying about the more remote causes of the end days like 2012, the Mayan Calendar, UFOs, and the second coming of Jesus.
If you are young, and haven't really had a chance to live, then learn how to survive in a much changed world, and stop wasting time with nonsense. Grow your own food, make your own clothes, and build a wealth of knowledge to see you through the coming dark ages.