Effective Natural Remedies for Anxiety

I seem to have panic attacks only in winters, maybe the lack of D3; who knows. The only natural thing that works for me so far is Peppermint tea. When I feel there is a PA in its way, I run and either prepare or buy ( if I am outside) a peppermint tea and the effect is inmediate. Is this a placebo effect or there is a compound in the mint tea that fights the panic attack? Honestly I dont know, but as long as it avoid a PA I will continue to try it. Hope this advice can help someone.