i suggest you to have a full body check-up again if your breathing problem is still very serious.
Hello~I am glad that all your tests came back favorably. I, too, have breathing issues at times, for me, it is anxiety and the more I think about it, the worse it gets.
I have found in some instances for me, that going to my chiropractor helps as certain vertebrae in my spine are pressing on the nerves that control the breathing, once I have a treatment, it gets better unless of course I bring it on again with anxiety and thoughts, but that has nothing to do with the spinal, they are two separate entities.