Can you see if you can come up with a hypothesis? I am confident it is reversible since it was a gradual change from one end of the spectrum to the other. Plus the fact that Chamomile used to make me more sensitive and Ashwagandha used to make me less sensitive, tells me that it is a spectrum that is changeable.
I’m guessing it has to do with Muscarinic Receptor Densities, since all those supplements listed seem to affect that type of stuff. Or perhaps a7 nAChR’s aka Alpha-7 Nicotinic Acetylcholine Receptors.