I get intense palpitations and panic attacks. Should I worry about my heart?

Hello doctor,

I am a 23-year-old male. Two years ago, I had intense palpitations, and I was diagnosed with anxiety disorder. I had panic attacks, but then I was able to recover by myself. For a few days, I had two panic attacks. And I am afraid that this is anxiety, or that my diagnosis was wrong as if I had some serious health issues. I worry that I have a heart problem. Even if someone touches my chest I feel uncomfortable. I do not think a lot. I try to calm myself, but somehow I am not able to calm myself no matter what I try. The main problem now is my anger. I suddenly feel so much angry, about very stupid things like I am walking on a road and a car blows my horn continuously I feel very irritated and angry if my girlfriend does not pick up my call I get so much anger and it is not normal. If I try to control my anger I feel numbness and hand shakes, I even have palpitations. This is very worrying for me as I think this is very serious this time. My heart palpitations go away only when I am in deep sleep or when I am doing something so deeply without noticing anything. I had palpitations two days before my exams, I tried calming techniques but it did not go away. But when I was in the examination center, when I started writing my answers I was so deeply busy in writing, that my palpitations go away. And then after the exam I was fine. But anger is ruining my life. I want to change the way I am. I am currently taking Sertraline and beta-blockers.