If you were my child, I would rush out and buy you some supplements starting with a multi-vitamin, Vit B complex, and a magnesium/calcium.

The magnesium alone will calm you down and ease many of your symptoms. Then you can regroup and decide how you want to determine and attack the underlying issues that's causing the anxiety- whether it's stress, nutrition, therapy, exercise, etc.

-Take an online questionaire to determine if you have Pyroluria.
-Get a blood test (25-OH) to check your Vit D levels
-Stop all sugar, caffiene, junk, etc for a few days
-Go outside and enjoy the sunshine