Flu Remedy ?

I suspect my husband has come down with the flu. Overnight he developed some nasal congestion - one nostril runs (runny nose and post-nasal drip) while the other (the left) remains blocked (this is making him very frustrated/irritable). Today he developed a sore throat and now has diarrhea. No body aches but does have a low grade fever and very low energy and a little cough. He has been very stressed lately. Occasionally this (stress that is) causes diarrhea also, so it may be coincidental. He feels better by familiar things - comfort foods, being doted on, cuddled, etc.

General characteristics:

anxious, easily angered/frustrated, depressed, loving, dependable, hard working, loyal, considerate, easily upset by change (new people, new foods, new jobs, unpredictable environments), stubborn, unyielding

medium height, large build (very broad shoulders, solidly built), over-weight, pale skin, damp (prone to yeast/candida - jock itch, nail fungus), thick dark hair

let me know if more info is needed. thank you in advance.