I have been hospitalized twice within the last year - "heart attack" symptoms.  I have had 2 stress test - echo heart tests, EKG, ultra sounds,etc.  They all are fine - my concern is that I am still having those symptoms - My father has had 4 by passes, stints and my mother has had what they called a silent heart attack.  My younger sister (46) is having a heart cath in about a week.
My question is - can I have blockages or valve "issues" even though all those tests are negative? 

Thank you