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Fast heart rates can occur from panic.
can occur from fast rate.
However it is better to be investigated for Coronary Artery
A depression - 1 mm or more / 80 millisecond from J point - is highly significant and suggestive.
You should see the doctor again and get investigated.
You will need Holter (ambulatory monitoring) / TMT (exercise ECG) / ECHOcardiogram
- to exclude the many issues involved in this type of situation.
If all is well, nothing to worry.
If any thing is suggestive, more need be done.
It is better to have them done and be re-assured.
Wishing speedy recovery