Flu!!!

My 4 year old just had the flu, luckily I only had it for one day and it was most diarrhea, I only threw up once. But I've barely eaten, only today when I was hungry and only small amounts. (Lunch I had noodles and chicken broth and dinner I had a plain bun fresh from the bakery). I've already called and spoken with my provinces free health care telecommunications and they said not to worry about the not eating so long as I was staying hydrated-which I was, but the freak in my can't help but think my baby starved for a full day! Anyone else have/had the flu and feeling guilty?