What should I do?!! need advice?

My son just came home from the nicu almost 2 days ago! & We went to rallys for supper.. after I ate I started feeling like crap.. & now I have the runs.. (tmi) sorry! but it seems like after that im starting to feel better.. the problem is though.. im scared its a stomach bug and I really dont want to give it to him... or do you think it was the food?! What should I do?!