HELLO,SIR MAM After totally quitting smoking tobacco nd canabbis i was developing a high heart rate,and suddenly one day got a panic attack where pulse rate was over the roof.I was terrified nd visited cardiologist did ecg,he told it was sinus tachycardia..nd suggested me to go to neuropsychiatrist,he told me these are withdrawal symptoms,bt 3months after,i am still getting random palpitations... I have attached my ecg,i am feeling very depressed,have i caused myself greater damage,or is it something related to sympathetic and parasympathetic nervous system response Resting heart rate is 70-80 Walking 120-130 But sometimes resting is also increased to 100-110 Any words of advice please doctors Regards.