Hi @tinyelvis, welcome to Mayo Clinic Connect, an online community of patients and caregivers. Naturally we cannot provide a diagnosis, but we can help with your search for answers or perhaps what questions to ask. To help you with your investigations, I found these 4 discussions that appear to describe similar issues.

- Mysterious shortness of breath https://connect.mayoclinic.org/discussion/mysterious-shortness-of-breath/
- Chest Discomfort https://connect.mayoclinic.org/discussion/chest-discomfort/
- Chest Pain/Discomfort since May 2019 https://connect.mayoclinic.org/discussion/chest-paindisconfort-since-may-2019/
- Costochondritis and lung problems https://connect.mayoclinic.org/discussion/costochronditis/

Was there anymore investigation done about the possibility of infection?