I'm not sure if it counts as a natural treatment but something that works for me is breathing exercises and grounding techniques. Another thing that helps me is yoga/meditation. I know yoga is technically exercise but for me it's the one tolerable kind. I have breathing issues due to my anxiety so exercise doesn't usually go well but yoga helps you stretch out and relax

Aroma therapy. Sounds lame. But if there are any scents that bring you back to a happy memory or calmness, utilize them. Doesn't necessarily have to be essential oils. I use my boyfriend's cologne sometimes for that reason. I also really like eucalyptus, it helps me ground myself.

Hey, of course exercise and nutrition are very helpful (at least for me). Another thing that helps me is drinking chamomile tea in the evening. In addition, I heard about herbal supplements called valerian root- I have never tried but maybe it's worth a try …