Hmm, your Dr could be right.
I would not worry about a heart attack at this point.
How's your BP and Cholesterol controlled, with meds or
Have you had your thyroid checked?
Would it surprise you if I told you, hypothyroidism is BY FAR the number one underlying cause of heart attacks?
Ask and insist for Free T3, Free T4 and Reverse T3 thyroid tests, for accurate thyroid function evaluation.
I would def see a cardiologist. Womens symptoms can be very different than men.