This is Dr. David
I am sorry you are having these symptoms.
if you are not feeling well, and having heart palpitations, you really should go to the A&E and have your heart evaluated again.
are you having symptoms of panic or excessive anxiety?
you could be having a panic attack causing your fast heart rate and chest tightness
do you know what your ECG scan showed?
pins and needles on your left hand could be a sign of a heart attack
which is rare in a 46 year old woman, but can happen.
you should go to the A&E for your heart to be evaluated again.
do you have an A&E close to you?