Neck and chest pain after surgery

Hi! I was diagnosed with SSS/bradycardia, and my traditional pacemaker was implanted 5 days ago. I felt like the pain was gradually subsiding until last night after a short walk, when I started feeling achy and stiff throughout the neck, throat, upper back, and chest. It's not sharp, just pressure and tightness. Mostly feel it when I bend over, cough, or swallow. No fever or other symptoms. Has anyone else experienced this, and if so, did it improve? I am taking acetaminophen, and also given a few doses of percocet, which I hadn't taken until last night. Of course it's the weekend, so can't visit the doctor. Thanks for any insight you might have!