I had a similar experience with chest pain and had
the ECG and
yes, everything was normal. Maybe your anxiety
has manifested into physical symptoms? If you're open to medication, please see a professional. But if you're not, I can give you some tips about keeping grounded and in the moment.
I just posted this to another member but this is called grounding: sit in a chair, both feet on the floor, hands on your legs or on your stomach. Close your eyes. Breathe deeply through your stomach.