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One possibility will be heart failure which will cause low blood pressure.
But other sins like leg swelling, shortness of breath with exertion, and decreased physical activities also should be experienced.
Dehydration is another common possibility from recent physical work outs, or infection.
Most commonly, medication effect can be pronounced over time as you improve your life style and lose weight over time causing excessive drop in BP.
In your case, last scenario is morel likely.
One of the medications ( lisinopril preferably) should be discontinued first.
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