Regarding fear of heart attack. Attack.

I 28 yr  young youth who consulted many cardiologists and did many health tests..after all reports are normal ..still some time i have fear of chest pain  and i think why he always feels out on my left side..  doctor suggested that I not to worry that's not a heart attack symptoms but my mind not processed that in good way.. when i sleep i also experiencing heart pumping which is clearly i feel and then he suddenly distrubing me and again my mind goes fear about heart attack.. and suddenly my hands get chill  and  blood pressure go up ..and when i travel with car , bus or train to another city for vacation or business purpose still mid of the journey i felt very fearing about there is any misshapping was done then who can take me to the hospital or i reach the hospital on time or not.. thats type of fearing i experienced on daily basis.. i so many news about heart' attack in young age is also very fearing me. please help me on this and suggest me a doctor where i consult perfectly