i just put a few drops of lavender in the diffuser and I closed the door. I see the mist coming up. I hope this calms me down.

Studies prove lavender essential oil to reduce stress and anxiety
If you need proof and are all about science and facts, you just found it. The Handbook of Essential Oils: Science, Technology, and Applications states the various clinical trials that support of the evidence that essential oil is a powerful form of natural anxiety treatment.

Lavender essential oil capsules have been linked to reducing heart rate during periods of increased anxiety
There’s also a study conducted by United States National Library of Medicine that tested lavender essential oils in capsules, which you ingest orally. When participants watched an anxiety-inducing film, the heart rate variation from lavender was significantly improved in comparison to the placebo. In other words, the study concluded that lavender essential oil capsules may be able to help those with acute anxiety. However, the effects it has on high anxiety is still unknown.