Heart Attack Support Group
Heart attack is a serious, sudden heart condition usually characterized by varying degrees of chest pain or discomfort, weakness, sweating, nausea, vomiting, and arrhythmias, sometimes causing loss of consciousness. It occurs when the blood supply to a part of the heart is interrupted, causing death and scarring of the local heart tissue.
As for panic or depression, it's ugly first cousin, if you need, see a professional counselor, shrink if you will. There is no shame in getting help and many heart patients benefit from therapy. Attitude is a factor in much of this and if you are one of those who can maintain a positive outlook you'll have far less issues to deal with.
Good luck on searching the answers out, let us know what you discover and how you are doing.