I have had PVC’s since I had Lyme Disease in the late 1990’s. My cardiologist (at the time) advised high doses of Magnesium Malate. It has helped tremendously.

I started having PVCs and tachycardia after covid. Exact same treatment that you were prescribed. So far, Cleveland clinic has not found an intervention that is effective. I am seeing an electro physiologist to look at a corrective procedure. I am not suggesting that is the route you need to go, but I had no cardiac symptoms prior to covid. There are a couple more medications that are strictly for tachycardia/ PVCs/ PACS. Speak to your cardiologist again and maybe ask about different medications. Calcium channel blockers are decent but your body does take time to adjust.

I've had both PACs and PVCs since getting COVID in January 2020 (ish). I had the exact same treatment. I still take Diltiazem, but, at 29, I'm looking for other options. Diltiazem is not recommended for pregnancy, and I'd like to start a family eventually.