Having Blockage In Heart, Episodes Of Vertigo, Double Vision. Taking Ambien, Neurontin. Side Effect?
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Side effect of the drugs is certainly the first consideration in most circumstances... The simple solution will be to stop it for a day or two and observe...they are not essential for the heart per se.
However, the description is highly suggestive of brain stem ischemia - reduced blood supply to lower parts of the brain. The same reasons that led to the narrowing of blood vessels to the heart - could also cause narrowing of blood vessels to the brain. A neurological consultation will be the best option - MRI and MRA (MRI Angiography of carotid and vertebral systems) is often necessary.
Discuss with your cardiologist - low output, alteration of rate or rhythm is not the cause.
Take care
Wishing speedy recovery
God bless
Good luck