Myocardial Infarction

2.5 years ago I had a heart attack and for about 4 months prior to the attack every now and again I experienced this eerie feeling of doom that would wash over me for a minute or two and dispate as quickly as it came on.  There was no warning or stress involved when it happened sometimes I was just sitting still reading.  It is a very disturbing feeling and is hard to describe.  After having a stint put in these wierd feelings stopped until yesterday and I had another. I was getting ready to order dinner at a restaurant when it happened.  It made me feel sheer panic and it scared me so badly I called 911 and was promptly taken to the hospital and admitted.  I went thru the usual 3 EKGs 3 blood gasses, and this morning a treadmill stress test all of which I passed with normal readings.  Now I am paranoid.....There must be a name for this "feeling"?  Please can anyone help ?  Has anyone every experienced this same thing?