None of these things are even closely related to protozoa. But they all stimulate a T cell response which seems to have broad antimicrobial activity. There were some old studies suggesting that the agent of Q fever, Coxiella burneti, a rickettsia, could induce lymphocytes to become transformed to a hairy cell morphology. But what happens in the test tube doesn't necessarily happen in nature. Unless there were some good epidemiological study showing an association between ehrlichia infection and a particular tumor, I don't think anyone would spend much time and valuable resources exploring this.
Anemia is present in acute ehrlichiosis, and liver enzyme abnormalities as well.
Perhaps bilirubin or heme breakdown product that are circulating in the blood could give a greenish-yellow tinge to the eyes because of the plexus of capillaries in the back of the eye. But one shouldn't use this as a diagnostic tool unless it has been validated by experiment. And really, vets should be the only ones doing the diagnosis. This is my bread and butter. We think we are only seeing the tip of the tick iceberg.