Theres medications for anxiety and there are techniques for example progressive relaxation has helped me alot when I have anxiety and have to be out and about, working volunteer work and so on. I carry around relaxation music and my therapist and I do relaxation visualizations during therapy sessions I take them with me too so that iF I am out of the house and I start feeling uncomfortable I locate the nearest restroom and take a few minutes to ground myself and relax.

So maybe the hypothetical person can talk to their therapist and they can work on the anxiety issues together and find coping tools that they can use anywhere - at home or even in the work place.