Kort,
I am so sorry that you are dealing with all of these worries right now.
It sounds like your doctor has done a thorough job of checking everything out in regards to your heart health...however, you certainly have every right to a second opinion...epspecially if you feel like your concerns were not addressed to your satisfaction, and if you were not given all the infomation that you needed from your initial visit.
If you would feel more comfortable with the doctor that saw your grandparents, then I would think that requesting an appointment with him would be a logical step.
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Oh, I just read that you were seen by a nurse practictioner? Have you not been seen by an M.D./cadiologist then?
I am a little confused...a nurse practictioner is not the same as seeing a heart specialist. If you have not been seen by an actual M.D., then by all means, if only for peace of mind, make an appointment for yourself.
We are here for you...keep us posted.
S.C.