Food poisoning in a 4 yr old and husband

Erica • Married with two beautiful boys. Trying to loose the weight and not get prego at this time.
We ate Denny's for dinner, I had a burger they had breakfast foods (sausage, eggs and pancakes) my little has thrown up 4 times and on the toilet once. After cleaning that mess my husband started vomiting as well. What can we do to ease the littlest tummy? Husband seems fine now but my little has woken up twice since 11 pm.