how do you get tougher?

Early early this morning something so scary happened to my nephew. He was climbing around in the dark and an entire dresser full of clothes fell on him. Some glass pitchers and vases on the dresser fell and broke, too, and the little guy was pinned between his bed and the dresser drawers that rolled out onto him. Thank God he didn't even have a scratch on him, but I was so scared that he was hurt I had a panic attack and thought I might throw up but instead just passed out near the toilet. If I ever have children, someone else is going to have to be with me during emergencies because I will be totally useless. Coincidentally, this dresser accident happened the day after my boss told me in one way or another that he thinks I may be too meek and mild mannered for the cut throat corporate world. But how do you get tougher?