Had frequent for few mins while high HR.

I am 19(M) with sinus tachycardia,pvcs and long history of horrible anxiety causing symptoms.My symptoms is Shortness of breath and sometimes its bad.Recently i had this strange pvcs happening frequently for few mins after a walk as like one few beats and then another then few beats then another and i am having strong chest pains lasting few secs too.Nowadays SOB happens all the time i just can't breathe from my nose especially during strong emotions like excitement or after an argument ot while playing video games and there are chest pains too.Now the pvcs happened like this Beat beat beat pvc beat beat beat pvc beat pvc beat beat pvc beat beat beat pvc and this is happening at 160-170bpm atleast (happened during a fast walk almost a run)i was terrified and still am.I used to get pvcs during fast HR before but this one was scary it happened frequently in the matter of secs but wasn't a run of them.I didn't have any symptoms during that except horrible anxiety.Help me please