Hi Rick,
I have mentioned previously that I occasionally switch on when I have had no meds, such as when I get up, or in the evening when my meds have long worn off. It happens 3 or 4 times a month, and I don't need the cold shower!!!. However it only lasts up to an hour maximum, sometimes only 10 minutes.
You say it took about 10 minutes to switch on after you got out the shower, but how long did it last? Have you ever had my type of "on" when you are unmedicated, and without the shower.
Just one thought, Ice cold water on the head has an effect on the permeability of the BBB. I can find reports which say the BBB decreases in permeability, and others which say it increases. If it decreases it, you would probabl;y switch on, and off again when it warms up and you have your defective BBB back?
Best wishes
Ron