I'm not certified yet to give medical advice but you can do some research on your own about supplement tablets like B12 and Omega 3 and magnesium tablets. Sometimes Tryptophan supplements or Saint John's Wort work. It all depends on your system. Like I said, I'd recommend extensive investigation about any kind of tablets to see what works for you best and your metabolism and diet and such, if you're looking for the token "quick fixes" everyone loves so much to get you through tough times. You can buy those in any drug store or natural stores.
Yoga helps a lot. Any kind of exercise, really. I mean, it helps for a lot of people not everyone. Sometimes it makes my anxieties worse. When i'm really anxious and i need to calm down in an instant, I take mechanical things apart and put them back together or build some magnificent buildings with kids' legos

I've learned that if I can get my brain to focus on one task I can reduce a lot of my symptoms. This sounds horrific but I also do math to calm down. The effects are amazing. It just focuses all my frontal lobe crazy energy on some simple math problems and suddenly i'm not listening to circuitous thoughts racing through my head and i'm not shaking anymore and i'm not convinced i'm going to die, i'm just having a good old time doing some math
In that case, i'd suggest trying some random things. Maybe writing out what you feel in the moment might help you release it. Or . . . maybe singing along to a song where you have to concentrate on the lyrics. Anything can potentially reduce anxiety, it's just the matter of finding the right thing. Doctor's aren't always helpful (this coming from a future M.D). I fumbled into all those techniques for myself since therapy and prescription medication never worked for me. anything to get you out of your head .(On second thought, perhaps paying much attention to the Tryptophan supplements aren't a good idea if you have any sort of social anxiety. Tryptophan is an amino acid that your body makes serotonin out of and it's been published last month that anxieties could be linked to too much serotonin rather than too little like they thought before. Everyone's different though.)
I like living in the world in my head because I'm in charge half the time.