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Given the comments that have been made coupled with the fact that you sometimes feel lightheaded, I think it might be a good idea to have your doctor refer you to a cardiologist. As to the "pacemaker" comment, does your doctor feel there is a need? Pacemakers are not inserted just for comfort, so I'm a little confused by his comment...Have you ever worn a heart monitor? An HR of 50 may be normal for you, but a cardio eval will give you a much better idea of whether a pacemaker or other intervention (medication) would be helpful/necessary.
Congrats on the weight loss...Here's to continued success!!!
connie