Is a week-long diarrhea in a 3-year-old serious?

Hello doctor,

My 3-year-old son had diarrhea for a week. He has thrown up a couple of times throughout the week as well. He was eating and drinking normally and has appetite. There does not seem to be any blood in the stool. And his belly ache goes away after each diarrhea episode which he has many each day. He is usually drinking as well. His doctors seem to believe that it is a viral infection and will go away in time. We just started a bland diet for him. Should I be overly worried? He is active and wants to eat and drink. So is this something more serious than we think or am I too worried?

Thank you doctor,

We are giving him a probiotic as well. His urine output is fine. This is the day the sixth of diarrhea.

Thank you doctor,

He had a better day today. One bout of diarrhea at noon then a small loose but less watery stool at after some time and nothing since. He has had lots of starchy food today. Some bread, pancakes and some white meat chicken and plenty of water.