Off of my training plan because of a headache

  I am a seasonal allergy kind of girl.  I have been having the sniffles on my rides lately, and I know it is just that lovely time of year when I will need to deal with my runny nose and watery eyes.  I take my over-the-counter drugs, and continue on my merry way.  Well, one fateful Thursday, I decided to tackle my to-do list and knock out reseeding the lawn for winter.  I am terribly allergic to the summer grass and had just let it die rather than endure the sniffling and sneezing brought on by mowing it, and so there was really little to do but clean up a few patches and get some fresh grass going.  The project required a trip to home depot, and my father to bring along his new toy- a pickup truck.  Projects with dad are a very fun way to spend an afternoon, and we did a great job getting the lawn reseeded.  I am very excited to see how the grass turns out.
  The allergies were as they usually are with any work on the lawn.  I had to take my contacts out and had to endure some sniffles, but nothing that made me worry.  That evening, the headache started.  My plan to ride 100 miles and run 20 miles were still on the agenda, but the next morning, as I put together my camelback and checked my tires on my bike, I came to the realization that this headache was getting increasingly worse.  Depressed by the thought of being taken out of commission by my sinuses, I made some tea, and sipped it slowly while telling myself the headache would clear in a minute and we would be off for another adventure.  Now, 4 days later, the headache remains, and I am pretty convinced that the headache is actually a sinus infection.  Oh, we are so weak that our tiny bacterial foes can bring us down without warning.  And now, I am going to go to the doctor for my chemical warfare against these tiny invaders.
  I am getting my hopes up that I will be well by Thursday and able to do a ride out to the IM course to check out what I will be doing on race day.