Hi... I Have A Valve Prolapse Which I Was Diagnosed

Hi... I have a valve prolapse which I was diagnosed with in 2010.... since then I've been good until I gave birth. I had a c section back in March 2014 and in June started feeling these heart palpitations that went and came on and off I've done an ultra sound of the heart a ct scan a chest x ray I had monitor for 24 hour. And all which came back normal
It's been a year already and I find myself experiencing the same symptoms now they feel like no relief in sight. Don't know what causes it or what's going on left with little answers and options. Just feeling worried and concerned.