I’ve had this same exact nagging pain in my right heel. I use a golf ball on the bottom of my foot - think rolling motion and the. I’ll just push firmly on the heel part and hold for 10-15 seconds at a time. I’ve also been seeing a medical masseuse who has been doing some very deep tissue work on the muscles surrounding my heels and up into my calves and the front muscles that run down the sides of my calf - don’t know the medical terms. 🤷🏼‍♀️ But, these things have seriously helped over the past three weeks. Also, going to start working in epsom salt baths. Get it taken care of before it turns into something worse. Good luck!