Trust me on this one. Suffered anxiety most of my life.
Best thing I ever tried, pretty much a cure actually is taurine. It’s a natural component of the diet, and makes up something like 0.1% of our bodyweight. It has been found to be low in those with depression and anxiety and research also shows it is useful for bipolar and seems to lessen the desire for alcohol (some doctors prescribe an analog of taurine to treat alcoholism).
I buy mine from ebay in 1kg bags. 1kg bags last ages because 3 or 4g a day is more than enough to scale my anxiety down.
Interestingly it is found in very high amounts in energy drinks, about 1g per 250ml can. I have always thought it interesting that energy drink manufacturers place it in their drinks in such large amounts. It probably takes a whole week to even get close to 1g of taurine from food.
I also found inositol useful but taurine I found to be better and cheaper.
Do with that what you will.