Chamomile oil is an essential oil that's been used for a variety of conditions, from digestive issues to wound healing, for many years. Emerging research has begun to shed light on other potential benefits, like its ability to help with depression, anxiety, and sleep. Roman chamomile is used for various digestive disorders including indigestion, nausea, vomiting, loss of appetite, and intestinal gas (flatulence) due to mental stress. Women use it for morning sickness and painful menstrual periods.