Can heart attack happen to a non smoker 30 y male with all normal cardiac test results and no fam hist, have anxiety... no symptom but worried..

Highly unlikely. While nothing is impossible, a heart attack is highly unlikely in a 30 year old with normal cardiac tests, a negative family history, and no symptoms. It sounds like your unfounded anxiety is the problem you need to deal with and not the risk of cardiovascular disease at this point.
Anxious. with normal cardiac tests you need to be taking anti anxiety medication such as Prozac, (fluoxetine) reduce anxiety level will make you feel better.