Well, I'd say allergies, except they mostly go away when I take time off anyway! So I'll pick anemia, so I'd have energy to work harder and pay off my debts and get out of town for good, and be more active and healthier. (Standard girl-stuff anemia - "That doesn't really happen" if you're an HMO medical professional, so I just gobble lots of iron supplements and don't even bother trying to give blood any more because I always flunk hemoglobin.)