Thanks for writing in.
Although the cardiothoracic ratio is not a very accurate way of telling us the size of the heart, your symptoms are definitely disturbing. I think you should get an ECG, a stress test
and a troponin
level ( if required).
it would be better to see your physician as soon as possible as we are probably looking at some kind of ischemic heart disease
( a condition where blood supply to heart is reduced). till then, avoid exertion, heavy food and any kind of stress ( including emotional stress)
Hope this helps