I know exactly how u feel, I suffer from anxiety & panic attacks & yes i get all of the same feelings u do & more ---like nausea, insomnia, tight chest, lite headness, feeling like u want to vomit, sweaty palms, agitation, sounds like stress to me, & worrying about your heart problems in the family r making u worse, try to relax & by all means get a second opinion as i am no Dr but only telling u of what i have experienced myself which is similar to u