Hi! Sorry about the delay. I haven't checked this forum in a while
Let me send you the link again. I am still in that program and I am doing a bit better but it does take time and patience. The big key is that the breathing issue is a learned/sub-conscious breathing pattern that isn't correct. He calls it an interference. Alexander (who came up with the Alexander Technique) also calls it that. And this interference leads to this need to take a deep breath and a sensation of breathlessness. So the whole course is intended to use the mind's eye (visualization) to release tension in the areas that lead to the breathlessness. But you will learn to release tension in your body as a whole. It's a very relaxing practice called constructive rest. The big key is that when you are super focused on something, the sensation goes away. That is huge and it makes sense that it is something that I am doing that is causing the breathing issue. Unfortunately, what we do is very sub-conscious and in order to reverse it, we need to become aware of the habits and interferences and undo them. Anyway, that's a summary. So far it is helping a little, but something makes me think this is the solution to my problem personally. It checks most of the boxes.
https://www.simonspire.com/breathing