We're so sorry that you've experienced nausea aftering taking our sleep aid, Marie. Our products are thoroughly evaluated to be safe when used as directed, and the safety of those using our products is our highest priority. Because an upset stomach is happening, we recommend that you stop use. We take your report to heart, and our ZzzQuil Team would like to gather details of your experience to see how we can further help. Please give us a call at 1-877-881-5813 from 9AM — 6PM EST Monday – Friday.