March had a cousin died my age 26 then around easter my body started too feel funny my chest thought it was my heart 5 blood sample came back negative?

Need eval. Should make sure that you have a complete evaluation including blood tests, ekg and sometimes other testing like stress testing.
Many Variables. Any time we have a tragedy like you experience it reminds us of our own mortality .It is not uncommon after something like this to feel very vulnerable for awhile. Straight year but your cousin. Try not to worry too much about low risk outcomes. Check with your doctor if you still don't feel right but remember that dealing with our own mortality is always difficult. You are not alone.