You must be a long-lost relative of some sort, because I totally freak before every vacation about getting sick and do the exact same thing! I feel like it is a win-win situation because the house is soooo clean that when we get home from being out of town, I can recover quickly from the "vacation" and not worry about cleaning.
Keep up with that vitamin C, eat lots o' fruits and veggies, and sleep as much as you can (just took human physiology with an OCD Professor who was terrified of flu germs and this was his constant advice).

Oh look, there's a banana just trying to dance his way into your mouth...om nom nom!
Yay!