How to medicate anxiety naturally?

I have an anxiety disorder, and was put on medication three separate times. I used to have multiple panic attacks a day, and the doctor's (three of them at separate times) have said that it's a chemical imbalance. My gram has the same thing, at has lived with it her whole life.

Now that I'm older and understand how to reason with myself and calm myself, I can usually keep my anxiety under control. It's only 1 or 2 days out of a month that it's really overwhelming and I break down and have a panic attack. I don't like taking medications everyday, especially anti-depressants, because they make things worse and I feel run-down and so... blah. So is there any type of herbs, teas, or other natural anxiety relievers? Something that can calm me down when it gets too hard to handle myself?