I'm a bit worried because I had a chest X-ray on May 20, which was all clear. But then another X-ray on July 1 showed tenting of the left hemi diaphragm. Can someone explain what this means and if I should be concerned? I was COVID positive on April 9, and I haven't been vaccinated yet. Plus, my heart rate is pretty high, and I'm experiencing chest pain. What should I do next?