HI and thanks for using the forum.
When you had your echo, ekg and stress test done, did you have a full physical? Your symptoms can be caused by a number of things besides your heart such as thyroid issues or even a virus that has you worn down. Another possibility would be walking pneumonia or another type of infection. I think you need to let your doctor know that you continue to have these symptoms he/she can help you get to the bottom of this. Good luck.
Bridget
also it seems to be getting progressively worse