I’m so sorry to hear about this. You have definitely set-up the best foundation, which is getting that imaging work done and having a clear understanding of the cause-and-effect behind what you observed. I have no personal experience nor do I have an idea of recommended treatments. Generally, it seems like treating symptoms as they arise and palliative care is recommended in these cases because there is no medical intervention to resolve the problem itself unfortunately.
If breathing is difficult, perhaps things that would lessen the need for rigorous physical activity, so having things closer together and ensuring flooring is ideal so moving can be done as freely as possible (i.e., no slipping or sliding). Eliminating any excessive environmental irritants might be helpful too, so ditching the dusty portions of hay or shaking out hay/litter before putting them in the box. Lots of hugs and kisses are probably helpful too 🙂
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.