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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
EKG is not a good way to check heart rate problem as you are having problems with activities not at rest.
Conditions like supraventricular tachycardia, atrial flutter can cause symptoms.
Hence you should consider getting a 24 hour holter monitoring first.
Then consult with a cardiologist as well.
Thyroid problem --serum TSH and free T4 should be checked as well.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/