Since these symptoms all began when you found out about your MIL's need for major surgery, it would be easy to say they are related to anxiety. But you have a lot of symptoms that are not normally considered anxiety based. (Triggered by anxiety)
While your PCP seems to be trying to help you, I have real issues with doctors who end a sentence with "it's most likely anxiety."
The diagnosis of anxiety should never be made until all medical tests have been done and anxiety is the only card left on the table.
You have listed, among other issues:
Lightheadedness/dizziness, chest pressure/light pain behind sternum that sometimes radiates around my ribs (the pressure/pain feels close to the skin), pressure between shoulder blades, SOA/labored breathing, the sensation that something is in my lungs and throat that I need to cough up, palpitations, I feel winded when going up steps or bending over, neck seems tight, and feels like heart is beating hard...............
I personally believe you should be seen by a cardiologist, who may possibly also want you checked out by a pulmonary doctor. Your SOB/labored breathing, dizziness, winded walking up stairs or bending over COULD be either a cardiac or pulmonary issue. While the echo will show abnormalities, an echo is much more accurate, in my humble opinion when combined with a stress test. That will give the cardiologist a much broader picture of how your heart is functioning. Routine blood work and a chest X-ray (even wearing a Holter) simply will not rule in or out many of your symptoms.
I realize I have probably scared you to death, but I am NOT saying you have anything wrong with your heart or your lungs. I am saying that many of your symptoms do not fit with the criteria for a simple diagnosis of anxiety. Bit we are all different and these symptoms may be how YOUR body reacts to stress/anxiety.
You have a lot on your plate right now that would cause anxiety for anyone, but I've always believed it is better to be safe than sorry. If for no other reason, do it for your kids.
I wish you the best and hope you'll keep us updated.
RubyWitch
Also to note, I am able to push move 1/3 acre without any issues. I have continued to workout at the gym. I typically spend about 30 minutes on an elliptical trainer and maintain a heart rate of over 120 bpm. From time to time, I'm a little light headed after working out.