Lavender reduces anxiety. I carry a bottle of lavender oil with me in case of anxiety. I put drops of the oil on my pillow at night and my skin. I drink lavender tea. I put one tablespoon in a quart of water and spray my home. It eliminates odors, kills bacteria, virus and fungus. It is also good for cleaning surfaces.
I swear by Tension Tamer tea and Rescue Remedy. Rescue Remedy is sorta pricey ($10 for a tiny bottle), but you don't take much. I have major anxiety attacks, and for the worst ones, two droppersful of Rescue Remedy and a cup of Tension Tamer does it for me within 15 minutes.
I've used Rescue Remedy. It's very good. Also learning bio-feedback, where you learn to control your heart rate and breathing is extremely helpful.
Be careful with lavender oil. It is a wonderful relaxing smell, but don't ingest the essential oil and note that some people can have strong (and bad) skin reactions to it. It increases your risk of sunburn.