I had a variety of symptoms and none of them immediately seemed to shout "anxiety" to my physicians. I was given dozens of blood screenings, X-Rays, CT Scans, EKGs, Echocardiograms, stress tests, sleep studies, only to be told that my heart is in wonderful shape, and that all of my symptoms were probably anxiety (and after being put on Lexapro for several months, the bulk of the issues really seem to have resolved).
I was experiencing: chest tightness, left-side chest and arm pains, random dizziness, random feelings of disorientation, massive blood pressure spikes that would last for hours (110/70 -> 190/120), headaches, pressure in my left abdomen, heart palpitations, and several more very worrying symptoms.
At the end of the day, it all seemingly boiled down to a generalized anxiety disorder.