Right now, it comes and goes for me. As in it's completely gone some days, and so loud I hear it over everything on other days (very high pitch). So far I haven't identified any pattern to it but I suspect hard workouts might spike it.
CBD oil (with enough THC to alter perception) makes it more noticeable and I feel more anxiety about it, but that's probably true for any drug/medicine that enhances perception. Will stay off the oil for a couple of weeks to see if anything changes long-term.