Can anxiety cause a heart attack, black-out or insanity?
Recently we had and interesting symposium on stres, anxiety and psychoimunology.
Guest were psychologists from UCLA stresslab
In this website: http://www.uclastresslab.org/
you can find a bunch of researches which conect various human mental conditions (including anxiety) with interkulin 6 and cortisol. Those two supstances are conected to hearth attack and other diseases.
I hope this helps.