had 1st heart attack at the age of 27 since then i have had heart attacks in 2007 2008 and most recent 13 feb 2009 im 40 yrs male not over weight dont drink used to smoke which i have giving up recently i had stents inserted in 2007 2008 and 2009 the doctors dont really know why i keep havin them i am scared i might have another i dont know what to do could u please help