DATE TREE GRASS HUM  FOOD  ALLERGY  (HUM is humidity)
4-03 high mod               
4-04 mod  mod               
4-05 mod  mod               
4-06 high mod               
4-07 mod  mod               
4-10 mod  low               ?
4-11 high mod              mild
4-12 high high             mild
4-13 high high             mild
4-14 high high             mild
4-15                       mild
4-16                       bad
4-17 mod  mod        CRON  bad
4-18 mod  mod        CRON  less bad
4-19 high high       CRON  less bad
4-20 high low        CRON  less bad
4-21 high high       CRON  less bad
4-22                 pizza less bad
4-23 high high       big meal + starve   nasty
4-24 high high  86   starve + big meal   nasty

Blanks are due to lack of pollen reports at weather.com. Itchy eyeballs started on the 16th, preceded to an uncertain date by some nose-blowing.

My eyeball analysis suggests a 4 day delay response to pollen levels.