Good Morning, My Name Is Cee-anna Hopgood, A 21 Year

Good Morning,

My name is Cee-anna Hopgood, a 21 year old female who works full time as a Case Manager for Employment Services QLD. I am currently suffering from day to day fear of having a heart attack / difficulties. My father passed away from a heart attack at the age of 39. Along with my current stress and anxiety levels does not help this situation. I wish to enquire at what age should I start being tested for any heart diseases? Is it possible for a heart attack to happen to me at this age? I often get pain / discomfort in my chest area which I like to think is caused by my anxiety and stress. I have visited my local Hospital once as I was worried. I had a ECG scan, chest exrays and multiple blood tests with everything coming back negative.
I want to know everything is going to be okay, is there anything you can suggest..

I look forward to hearing from you,

Kind Regards,
Cee-anna Hopgood