Hello, kcg

Definitely anxiety can be controlled somehow, by diaphragmatic breathing, some relaxation techniques etc. But the fact is, it can't be controlled in any period of time, sometimes these methods work and instantly remove symptoms of anxiety. Sometimes they don't. That's why you don't have to be attached to the idea of controlling your anxiety. Because if you get attached to it, your anxiety may grow. You think: "Oh I am so nervous. I have to get rid of it somehow! I will breath deeply! Oh it doesn't work! Why? Yesterday it worked! What should I do! I feel so bad! I have to get out of this!" No you haven't get rid of this! If you can't control it in the moment so be it! Accept it! You feel as you feel. Relax and let it be. (I don't mean you have to stop trying diaphragmatic breathing - it's a good practice! But if you can't influence your anxiety with this so be it. It's ok.)

Actually sometimes you can control anxiety by not having the desire to control, by accepting what you have. The article in the internet "Don’t Fight the Funk" reflects this idea. You can find it and read it. It is good.