Hello.... You did not mention details of your husband like age, since when he is hypertensive, since when he is taking drug, which drug he is taking any other associated symptoms with shortness of breath like leg swelling, chest pain, palpitation. Still, according to your description, it is ,likely to be hypertensive heart failure. In long standing hypertension, generally left ventricular hypertrophy occurs that causes systolic dysfunction that will lead to breathlessness on exertion due to reduce ejection fraction. So in my opinion continue your anti hypertensive drugs as your blood pressure is controlled along with that start Tab Lasilectone 50 mg twice a day. Thank You