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It could be ‘gas’ - but it is a vague term and has different meanings to different people.
A normal EKG is reassuring...
You should go for further investigations –
The next step is stress test
. TMT (Treadmill Exercise ECG) / preferably with thallium isotope – will be the ideal way to evaluate ischemia
. This is to assess the physiology (function).
If there is a suggestion, the next step is to see the anatomy. You may need catheterisation and coronary angiography
with a view for possible intervention. Coronary arteriography is invasive but it is the gold standard for this.
Better be safe than sorry - treated if a problem is found / Happy, if it turns out otherwise
Wishing speedy recovery