Yep, I can definitely relate with the experience you describe. My suggestion to you, if I may, is to keep going. Don’t stop after only 30 days ;) I have been taking ice cold showers every day since two years now. And I completely skip the hot water. 100% cold shower experience. I feel insanely excited and…calm. I think it has to do with the effect that the thermic shock + the deep breathing have on the vagus nerve :)

cheers, Ale