I was reading a book called "Life Force" by Tony Robbins. It was a pretty good book, but near the end, there was talk about a shot that goes in the neck (of all places!) that can help with anxiety.
I decided to look further into it. I read a couple white papers, and later found video after video of people claiming that it essentially cured their anxiety. The shot is called "Stellate Ganglion Block" (SGB) The idea is the body's "fight or flight" response, depending on the situation, can get heightened over time, which may lead to increased anxiety. SGB is just a local anesthetic. There are two nerves on the left and right side of the neck, the stellate ganglion, where the brain communicates with the parasympathetic nervous system. The shot goes on one side, and blocks the cortisol response in the nerve.
Eventually, after thorough research, I bit the bullet and got the shot. I found a place 30 minutes from where I live that does it. The shot is NOT covered by insurance, and is very expensive. That said, I feel great now! I haven't had an anxiety attack in over sixty days, and more to the point, I don't even worry about having an anxiety attack any more because my anxiety is so much lower.
I recommend you do some research if you're interested, and of course, consult with a medical professional. Still, this is a recommendation from myself, especially if you have a history of anxiety attacks.