I would say that there is only ONE thing you should have ANY concern about at all - make sure that you are truly feeling better and are healthy. If you have 10 weeks of 60 mile weeks and are only one week from the season starting, the only thing you can do to screw up a really promising season is push your body when you are sick.
If there is any week to lay back, it is the one before the season starts. A few days off will possibly make your legs feel a little funny when you get back at it, but you have lost virtually no "fitness."
One thing I alway try to impress upon runners I coach is the idea that one workout will never make you even the slightest bit better, but, one workout can destroy an entire season. Fitness comes from consistency over months and years - not consistency over days.
Like I said, missing a few days or even a week may seem like a big deal now - but trust me, it is nothing in comparison to the frustration of missing a week that includes your district or state meet. Get healthy, and then build on the great summer you put in.