I have terrible anxiety as well and my holistic MD put me on Lumina made by Metagenics.
It's got L-Theanine, DHA and EPA as well as a Natural Marine Lipid Concentrate in it.

The bottle says it is designed to support Dopamine Activity. My doctor say my dopamine levels are probably messed up.

It also states "It is designed to support healthy mental function and relaxation-issues related to proper focus, attention, learning, and memory-by providing nutrients for modulating the metabolism of neurotransmitters such as dopamine, norepinephrine and GABA.

I've been on it 4 days now and am just starting to notice a slight calming effect.

I also took 5HTP in the past with some help but mostly helped me get to sleep.

Another supp that was suggested to me was ADR by Pure Encapsulations, it's an adrenal support and I was told by my Osteopathic Doctor with really helps with ADD type anxiety
hth