Dear friend, welcome to HCM!
and PVCs (if really there) are of course dangerous and need urgent evaluation and treatment.
Are you already on any medication for it?
Was a detailed evaluation, EKG, holter, 2D echo , cardiology opinion done last time?
Few PVCs diagnosed on EKG and not associated with anything serious and asymptomatic are manytimes accepted in healthy individuals.
There are medical criteria for them as to when to treat.
But atrial fibrillation has to be treated. it can kill.
Please undergo a new evaluation to see if there is ischaemia, electrolyte imbalance
or only conduction problem. A cardiology consult is must.
stop heavy workouts till you are medically permitted.
Take care and please keep me informed of your progress.
I hope to have answered your query satisfactorily.