I'm sorry I can't really offer any particular suggestions with regard to your concerns. My personal, non-professional thinking would be that there really aren't any specific things you could do to address this particular concern. (Perhaps some other members, here on PC, will have some suggestions.)

From what you wrote, it sounds as though what you are struggling with is related to anxiety. And, at least from my perspective, anxiety reduction is something one has to work on consistently over time via such things as getting plenty of physical exercise, possibly doing meditation, avoiding the consumption of caffeinated beverages, and other things. It's really a lifestyle change that, over time, leads to a reduction in one's over all level of anxiety & thus one's tendency to develop the kind of stress reactions you describe.

Having written that, though, here are links to a bunch of articles from PsychCentral's archives on the subject of how to reduce one's level of stress as well as one's over all level of anxiety. Perhaps some of the information in these articles will be of some help:

https://psychcentral.com/stress/

https://psychcentral.com/lib/6-ways-...-less-at-work/

https://psychcentral.com/lib/4-tips-...l-with-stress/

https://psychcentral.com/lib/tips-fo...g-your-stress/

https://psychcentral.com/lib/20-tips...e-your-stress/

https://psychcentral.com/lib/strateg...ty-and-stress/

https://psychcentral.com/lib/9-ways-...ere-right-now/

https://psychcentral.com/lib/15-smal...iety-symptoms/

https://psychcentral.com/blog/3-tips...hrink-anxiety/

https://psychcentral.com/lib/the-pow...-stress/?all=1