Welcome to HCM.
You have not mentioned your age or the location of the hole. Holes can occur either in the partition separating the ventricles (Ventricular septal defect
- VSD) or the one separating the atria (Atrial septal defect
- ASD). These defects can cause a heavy load on heart in addition to mixing the oxygenated and deoxygenated blood.
This burden on heart will reflect as feeling tired easily, breathlessness after climbing a short distance, uphill. etc.
Best would be to consult a cardiothoracic surgeon and get surgical correction of the defect done if possible.
Wish you all the best.