I'm so sorry to hear that luplodw. I haven't personally had to deal w/ it, but I know some of my classmates that are from the area have family member who were affected by the flooding. I know it's so much easier said than done, but try to be thankful for your & your family's safety & what you do have. I know it will be hard, but maybe you can try throwing yourself head first into studying for the time being to try & keep your mind off of it. And don't forget that it's ok to have "freak-out" moments... cry, panic, etc. if you need to.
And I know it's not much, but we're here for you *virtual hug*