Panic disorder or heart attack? Anxiety?

Hello Dr. Since one year my heart start to beat very fast, with dry mouth, dizziness and lose of control and after less than one hour i felt normal. Made ecg and eco and holter and everything was normal. Since one month and half i went to a physilogy doctor and got treatment for my panic disorder(escitalopram and clomipramine hydrochloride) felt much better than before but still have some panic attack in a week once or twice, which take only 20-30 min. But since i had this panic attack since a year Suddenly i feel an electric shock and a sense like squeezing arround my chesht and stomach, is this nornal or happened because of this anxiety ? I got X ray for my chesht and it was normal, liver also normal. Please help.