I stretched/took a deep inhale and it caused my chest to seriously hurt right under my Lt breast(1-2min duration). This has happened only twice in my life, the last time I felt my heart actually throb (was when I inhaled a deep breath). I am a gen U.S student,I had a echo student scan me and she vis. a flicker between 2 chambers during diastole. Her RDMS echo instructor confirmed there  a "small/common defect." I cannot unfortunately remember if it was between the atria or ventricles but my guess would be ventricles. Could this be causing my symptoms? Are their things I could be doing to avoid the episodes?See a doctor asap or can this wait til later on in life?