Im 20 Years Old, Ive Been Diagnosed With Premature Arrhythmia

Im 20 years old, ive been diagnosed with premature arrhythmia around 3 years ago but they said its not serious
For the past month I’ve been having terrible gerd symptoms and im terrified of having a heart attack when i feel heartburn.
I went to the doctor a couple of days ago with all of my symptoms and she said i have tonsillitis and a virus thats causing everything but im not so convinced cause I have a lot of complaints and I don’t think they can all be explained by a virus!
Symptoms: right and left under breast chest pain, middle abdominal pain, throat pain, back discomfort, pms,collarbones pain and dizziness, also tingling that comes and goes.
I also have severe anxiety