Never been to Briarwood specifically but something similar happened to me after I visited a decommissioned psychiatric facility in rural Wales back in 2019. Took some photos inside, felt fine at the time, then spent the next three weeks waking up at exactly 3:14am every single night. Not roughly 3am, like 3:14 precisely.
What kind of thing do you think followed you home? Are we talking physical disturbances, sounds, that horrible feeling of being watched, or something else? Asking because the nature of it might say a lot about what you picked up or what picked up on you.
Also did you take anything from the site? Even just a stone or a piece of debris? That's the first thing people always ask me when I share experiences like this and honestly its relevant more often than people expect.