Vomiting and diorrheoa in 18 month old?

F

My 18 month old has been vomiting a couple times a day and most of her poos (not all though :/) have been runny and watery for almost a week now, and a cough has also developed in the last couple days. It doesn’t seem like it’s stopping or getting any better. The couples times we’ve thought surely it was getting better, we were wrong. Two different doctors have said it’s gastro. But any time I’ve ever had gastro it’s been 48 hours tops. Not six days!!!

My daughter is eating plenty, in a good mood for the most part (except when she throws up or poos or has what I think is a stomach cramp because she cries and I can feel her tummy tensing), and drinking plenty too. Doctors aren’t concerned about her being dehydrated at all as I’ve made sure to keep her drinking water.

Anybody else experience something similar in their little one? Was it indeed gastro? Or are these doctors misdiagnosing and it sounds like something else?