Claire Weekes, who somebody else in this thread recommended. She's the pioneer of the approach. She wrote mainly in the mid-20th century but her work is still accessible.
Also look at Kevin Majeres' work, for example: https://www.youtube.com/watch?v=lGa-jQJazpY
Also look at the DARE Approach to anxiety: https://www.youtube.com/@DareResponse
They all say variations of the same thing, which is that you need to train your brain not to fear your anxiety.
This approach ought to be the standard -- it really works, and is well-demonstrated in the literature.
Also exercise every day, or as often as you can. Both weight-training and cardio are good. Swimming is excellent.
Don't spend much time analysing some deep-seated reason for your anxiety. A little bit is fine, but going too deep is a waste of time, and can actually make it worse. You want to train the rational part of your brain to disregard the anxiety signals coming from your amygdla; and over time, the amygdla's messages will become less and less intense. If you spend time thinking 'why why why am I feeling this way?', your brain starts treating the anxiety signals as important, which is the opposite of what you want.
I would strongly recommend against changing careers. You will not be making good decisions while anxious, and other careers will not be less stressful.