@dcm8299, I am a 63-year-old woman, and had Covid twice--even after being vaccinated.
After the second bout, all the breathing symptoms you describe sound exactly like mine did.
I should add, that I went through radiation for throat cancer a few years prior, which did cause much mucus build-up. However, the breathing issue did not arise until after the Covid.
It took over one year, many doctors, all the usual pulmonary test, x-rays, (all normal) etc., before I received a scoping of the esophagus (in-office procedure). It was determined that my Vocal Cords are bilaterally paralyzed. My ability to eat, drink and speak are fine, but air could not get through properly, thus, the shortness of breath. I ended up with a Tracheotomy, which has greatly helped me. Also, Primetene Mist--the inhaler sold over-the-counter--was a miracle for me. Before the Tracheotomy, I would almost pass-out just bending over to pick something up off the ground. The Ephedrine in the inhaler is a God-send, and a must try. If the Pharmacist had not recommended that inhaler, I do believe I would have died. I hope you find out what is causing your shortness of breath.