Had sob with elevated bp. Went to ER, had chest x ray, d dimer, CBC, urine check, glucose test. All normal. How sure can I be all was indeed well?

Some thing minor. If you go to your family doctor , who knows your medical condition , ER doctor do not know you , has to do all the tests to make sure not to miss a serious problem , compelling reason to see your family doctor on regularly . Now it tim to visit and take care of your BP.