Though he has been known to have slight allergies, and has a deviated septum
, these more severe symptoms began to appear after moving into our house, which is very old.
The first occurance happened where he works, after he unloaded a truck load of hay straw. Assuming it was just a bad allergic reaction to the hay, we put it aside after he recovered. Recently, however, these episodes have begun to occur quite often, even during tasks that take little activity.