Why do I feel a physical pain in my chest during guided heart-opening meditations?

Whenever the guide in a meditation asks me to visualize a green light in my chest or to open my heart, I get a sharp, aching pain right in the center of my chest. It's not emotional; it's a real physical sensation. My kundali suggests a deep-rooted issue concerning inner security and relationships. Could this be the physical manifestation of a karmic heartbreak or a deep betrayal from a past life that is blocking me from receiving the benefits of this practice? My name is Priya, and I was born on 7th September 1993. Time: 4:15 PM. Location: Jaipur.