Mine began on 3/18/13 in the form of shortness of breath, blurred vision, heart racing, and light headedness. Over the next few months the symptoms would go from occasional to constant. Doctors kept telling me it was anxiety but, being a stubborn guy, I refused to accept it and went to several different doctors to hunt down a biological reason. Chest pain, light headedness, dizziness, tingling and numbness in my head, arms, fingers, legs, etc are all pretty common for me. Also, I will have elevated blood pressure during these spells, around 140/90 but it's gone as high as 180/115. Around october last year I began having migraine headaches as well. Fortunately, now that I've overcome my stubbornness and accepted the anxiety, the attacks have reduced in severity and frequency.