Hi well come to HCM.
Fix stt changes are observed many a tinme without coronary heart disease
. For years
together nothing happens. At times this kind of changes are associated with anemia
, they may be non specific. There is syndrome called Mr X syndrome
in which though coronary arteries are normal still pt gets anginal pain without Ecg
changes. But in your case it could be anxiety
due to awareness of stt changes in ecg.