It is very likely that since all your heart tests are normal your symptoms are not related to heart disease. You may want to get your blood pressure and heart rate checked lying down and standing (orthostatic response).Sometimes this can provide a clue to such symptoms.
Hey there if_i_had you, carlot, Thompson383, Bluedog, people013, zuzzu, ajibdi, stinky534, idathunkit, tactac, help30439, cheeta_breeda, neegnomer, crabdaddy358, save_a_heart & sleepy_pete. That's quite a few screen names for 5 weeks, but I guess you need them when you ask the same question once or twice a week.
Still not feeling better? Hope you get better soon so more people, those that follow the two questions every 6 month guideline, can get their questions on the forum as well. Again, I would invite you to the heart disease communtity where you can network with others. You may want to try the anxiety community as well.
Good luck, I'm sure you'll get the same answer again.