I had been taking 25 mg. of amitriptyline for 2 years at bedtime, but stopped taking it a few months ago. Since stopping I have been experiencing PVC's skipped heart beats and what may be described as "panic attacks". I have had EKG's, Holter Monitor and the results were normal, but in a 5 hr span on the Holter Monitor they found that I was having around 77 PVC's. I have never experienced PVC's or "panic attacks at all before taking this medication. Any input would be helpful. Thanks