Not sure if this is helpful or one of those "I didn't need to know that" situations, but I recently saw a video where a guy said he developed an allergy to cockroaches after working with them for a while. He said that he simultaneously developed an allergy to pre-ground coffee and discovered that it was because there's a "maximum allowable animal protein" in those products; he's since switched to whole bean coffee and can drink it without breaking into hives.

Ignore me if this isn't applicable. I thought I'd share, just in case.