Got bug sticking around the vicinity

Mary came home yesterday from school fine. At around 8pm she complain that she had a tummy ache and ended up that she thrown up. We were thinking of giving her an oral suspension and so to settle down her stomach. We got this when she has stomach problem last few months. I was relieve after she took the medicine, she went to sleep but then she keep us waking us up. :( I had a rough time last night :(