Trying not to Stress

I'm literally sitting on the couch trying not to panic. My husband just left for 2 weeks to help with the relief efforts in Houston and I don't know what to do. In the five years we have been together we have never been apart for more than a night and now I won't have him for two weeks. And to top it off, I'm 36 weeks pregnant. I told him he could go and I know he really wanted to be able to help, I'm just one of those people who worries constantly. Advice on how to get through this or put my mind at ease?