Last night had stomach cramps, nausea and malaise. vomited 4x in 5 hours. this afternoon stomach cramps gone but vomited violently 3 more times plus 1 episode of diarrhea. is vomiting like that normal with a stomach bug?

Depends on details: That can happen. A simple tummy ache with symptoms like nausea, vomiting, or diarrhea, whether at home or traveling, may be from a virus infection, bacteria infection, contaminated food, etc... A typical normal healthy person usually recovers easily, such as with the help of one day of Pedialyte oral solution. If worrisome, one's doctor or the ER should evaluate.