The CAMH states the following about Anxiety Disorders:
"Each of these anxiety disorders is distinct in some ways, but they all share the same hallmark features:
I can tell you for a fact that the fear I was feeling was not irrational. Not to me. It was real and true and so when I read things like this I thought to myself, well... that doesn't sound right, I'm not dealing with irrational thoughts, my fears aren't excessive... it was sort of confusing. The "apprehensive and tense" feelings? Yeah... that was for sure going on. And while I'm not sure I was aware I was having difficulty managing daily tasks, I certainly was noticing distress... which I guess I could say was causing difficulty.
They go on to say "The physical symptoms of anxiety may be mistaken for symptoms of a physical illness, such as a heart attack."