Talk to Cardiologist on Heart Rhythm

After an anxiety attack 3 month ago, become very sensitive, very small stress & anxiety cause physical symptoms; shortness of breath & heart rate does not exceed 90 but some thing like palpitations or irregular rythm happens and cause restlessness.

I already have GAD, burping , shortness of breath and palpitations issues from 3-4 yrs but didn't know the cause , was coping with them and living in daily routine but now I am stuck at home , when have to go out symptoms start.

Which low dose , effective and safe medicine Can I use to minimise these symptoms and get calm and relaxed?