Sick with the flu (respiratory) for the past week, no gastrointestinal issues. symptoms are mostly gone, but now watery, yellowish diarrhea?

Flu symptoms: The diarrhea is likely a by product of your viral illness. I would recommend placing yourself on a clear liquid diet - no diary or caffeinated beverages and no alcohol. Small quantities frequently - as your stool starts to form up you can gradually increase your diet. The last items to add back - diary and highly seasoned foods. Good luck