Edith said:Fresh fruit (especially banana's! - there's something special about them... I don't know what) and breathing excercises. I find that mornings when I have a healthy breakfast and do even just 15 minutes of yoga I feel much MUCH less anxiety.
As far a vitamins, or pills, or drugs go I don't know what works - I just know that stretching and a banana in the morning is way cheaper than weed.