Was diagnosed with bronchitis, suspected to be bacterial+secondary to uri. day 6 of augmentin.cough and energy improved, phlegm less and lighter colored. however, chest tightness, short of breath and chest discomfort remain. is this normal?

Bronchitis alone is unlikely to cause chest tightness or shortness of breath. This situation easily could be complicated by pneumonia; or it might have started with more than a garden variety URI, like influenza or covid. Ask your doctor about testing and/or treatment for them, and whether a chest X-ray should be done. Don't delay: this sort of problem can get more serious quite fast. Good luck.