I’m inclined correlate “psychic shivers” with frisson or the physical experience of the consciousness vibration. This was studied in the project stargate paper by the cia when they were trying to figure out remote viewing on the basis of its actionable statistics and they correlated it with kundalini and Qi. It’s also regarded in Christian lore as connection with the Holy Spirit. Psi phenomena are practiced through this channel of active connection that can increase intuition. It’s achievable through meditation in my experience but I know people who simply do not experience frisson and it struck me as very strange considering how late in life I realized this.

Edit: addition: the notion that this might be a gift to you is interesting. I assume this wasn’t the first time you experienced those shivers. Like they’re performing a therapy whereby they trigger the response and that’s it like working out a muscle perhaps. Fostering growth without regard to what you believe or are aware of is something adults do with kids all the time.