Terrible, terrible things happen when a budding allergic attack combines with an infection of the upper respiratory tract (presumably viral). What started out as a minor cold was amplified to much greater levels, and the resulting sneezing and coughing worsened the general effects of dry, dusty air.
The resulting several days of misery have finally petered out in a moderate case of tonsillitis and an earache associated with a blocked Eustachian tube. My immune system is usually fairly robust, but when it fails it fails catastrophically.
At least the fever has gone down.