From last year I have had episodes of panic attack. In a recent attack, my heart rate came up to 140bpm and bp up to 176/110 for few mins. For around 20 mins bp was high i.e., above 140/90 . Ecg, echo, brain mri, neck mri, abdominal CT, abdomen ultrasound, renal artery all came out normal. What could be the reason for this panic attack? Attack happens out of no where. I dont have any stress, family or financial problems also. Lifestyle is sedentary. Am too lazy. I take concor 2.5 currently for bp and palpitation