With so many risk factors present in your case (being overweight, smoking, family predisposition…)it's not a surprise that you have been experiencing congestive heart failure (CHF). Chest congestion, breath shortness and fatigue could be attributed to CHF but are probably not due to low blood pressure. In fact, low blood pressure may be beneficial in this case because high blood pressure worsens CHF.
One of the purposes of the CHF therapies like prescribed diuretics, ACE-inhibitors, cardiotonics and the like is to reduce the blood pressure. However, when low blood pressure begins to cause problems like vertigo, disturbed vision, or syncope you might consider treating the low blood pressure. Additionally, it is worth noting that you didn’t mention any symptom that can be due to the low blood pressure, so your self-diagnosis may not be correct.
COREG (Carvedilol) is β and α1 sympatic blocker that is often used for treating CHF together with diuretics, ACE-inhibitors and cardiotonics.
IMDUR (Isosorbide mononitrate) is a coronary dilatator that is used for the prophylactic treatment of angina pectoris; that is, it is taken in order to prevent or at least reduce the occurrence of angina. You can use IMDUR if you are experiencing chest pain due to angina pectoris. IMDUR is not used for treating CHF.
Both COREG and IMDUR can cause hypotension as side effects.
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