What physical ailments did deborah suffer from as a result of the excitement and stress of seeing her mother's cells for the first time, and learning about elsie?

Deborah feels pain from blood pressure and her blood sugar being high as a result of confusion. She saw a doctor who recommended her to reduce stress; she did reduce doing research trips and thereafter started making contact with Rebeca who from this point was only telling her positive developments.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.