I Have A History Of PVC's And I've Been To

I have a history of PVC's and I've been to my doctor to get checked out, EKG and blood work. I am concerned at having increasing, unexplained soreness across by shoulder blades as the day wears on. I walk my dogs three miles every morning and have not experienced any symptoms during or after my walk. I was taking Buproprion which did increase PVC's. I stopped taking on Saturday, May 29th. I think PVC's have decreased and generally feel better except for soreness across shoulder blades. No lifting or other activity that explains this.