How can I conquer this phobia?

I have had a lot of health problems this summer including appendicitis, stomach ulcers, and a horrible stomach virus. I am already a hypochondriac so this summer was my worst nightmare. I am completely well now and doing great and leave for a vacation this weekend. However, I can't get excited about it or look forward to getting away to relax because I am so afraid of getting sick. The whole time I am on vacation, I will be thinking about what if I come down with something and I am not in town near my doctor. It is a debilitating problem and I just want to enjoy my time out of town. What can I do?