Hi, so basically. i heard that if a pvc falls on a t-wave, that can trigger ventricular fibrillation, and sudden death. as an 18 year old who experiences frequent isolated pvcs due to stress/anxiety on a daily basis, is this something to worry about?

Not conversant with your prior therapy, but would recommend a full effort to control your emotional issues. Some valuable approaches include meditation, hypnosis, biofeedback, and cognitive-behavioral therapy. The cardiac issues which you fear are quite rare, and tend to occur under rather unusual circumstances in susceptible folks, very unlikely at your age.

You need a full cardiology evaluation. Not all individuals with ventricular premature beats are at risk for serious cardiac events but a full cardiology evaluation is in order. If anxiety is a significant contributing factor, the cardiologist will be able to make recommendation also. Action is needed on your part. Good luck.