Weird pain in back and chest to beat of heart after ETS surgery

Long story short, I had ETS surgery a few weeks ago as I have lived with a VT condition that was initially provisionally diagnosed as CPVT and then later changed to a sort of unidentified monomorphic VT that the cardiologists are still doing genetic research for. I don't know if the surgery has had any success yet as I haven't really done much strenuous exercise beyond running for the bus a few times, but recently I've noticed a pain in my back and chest. My back especially feels really tender sometimes; I seem to notice it most after I've gone for a walk. I don't even know how to describe the pain. It's not debilitating, but it is very noticeable, especially when someone applies pressure to my back. My chest feels a similar pain to a lesser degree. Sometimes when I move around, though, or stand up too quickly, I'll feel this pain coming in and out to the beat of my heart, or at least I'm fairly certain it's to the beat of my heart. It subsides after 20 seconds or so, but it's definitley something I've noticed recurring since my surgery, and would've thought it'd at the very least improve after 3+ weeks. I'm 5'10, round 70 kg and 21 years old. I've thought about calling my cardiologist about this if it potentially persists/worsens, but for the moment, it doesn't seem to have any adverse effects on my day to day life beyond being mildly uncomfortable.