Hello, For 6 Months Now Every Time I Go To

Hello, for 6 months now every time I go to bed or a stressful situation at work I feel my heart pounding not sure if it is racing or just pounding hard. At night this keeps me awake and scares me , sometimes my hands feel tingly full of pressure . I have had a echo cardio test done and it stated my heart is not relaxing to let blood out properly and my right ventricle is slightly enlarged. My mom had same thing kinda only she drank alcohol and smoked ... I don't not drink or smoke now for over 20 years ,I am 54. I do have extreme anxiety. I hope you can help as most of my test show normal ... am I going crazy... as that's how I feel some days.