What you describe, episodes of severe hypertension are a most serious situation. There are a number of potential causes but the list does not include pulmonary hypertension. I suspect that the antibiotics were given for your lung condition, not for anything related to your blood
pressurePressure ulcer.
One cause of such episodic rises in blood
pressurePressure ulcer is a tumor of the adrenal gland, called pheochromocytoma, which can periodically discharge the equivalent of adrenalin into your blood stream, but there are others. Kidney specialists and heart specialists are experts on high blood pressure and its causes and treatments.
You should seek consultation with one or the other, without delay, and stop relying on emergency room care.