My 19 mo. old grandson has multiple food allergies and asthma which is being closely treated. However, the last five days he has been vomitting when he lays down and has severe loose stools but no fever. Does this sound viral or something else?

Optional Information:
Male, Age: 19 months, Alaska

Already Tried:
bananas and applesause to eat, although not very interested in it, and drinking very diluted juice but not as much as usual