fever abd diarrhea

Hi everyone,
My son (8 months) had a fever at the start of last week, went off all food and milk and had diarrhea. I took him to the dr and the said it was probably a viral infection. Well his fever disappeared a day later, and he started drinking his milk again. Since then though, he has been picky on his food ( sometimes refusing altogether and sometimes eating well), he has also continued to have diarrhea on and off and two days ago his fever came back. It was not high but today got to 39 so i took him to after hours dr who checked him out and said it could still be the virus, this is a week and a half later.

Has anyone else experienced anything like this? I know if its a virus we have to wait it out, but how long should it go on for, im just worried it might be more serious and no tests are being done.

Has anyone got you to take a faecal sample to the lab? If they haven't then you should ask for a lab form and get one done. That way they can exclude anything more serious than a virus.
DS has trouble with diarrhoea and it was recommended to not give formula for at least 24hrs, or if we had to give it then give half strength formula. We were also prescribed pedialyte and used that instead of formula to keep ds hydrated. The withhold formula or give half strength was on starships recommendation. When we didn't give formula for 24hrs he got better very quickly.
If he has 8 hrs between wet nappies (as per healthlines advice), or fever high and won't go down or you are worried then take him back to the gp.