No hot water for me - nearly 3 years now. Except in hotels and then it feels weird.

I don't. Stimulate, not annihilate

Your message is garnering a lot of interest.

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Depends on how sick I’m feeling. If I’m having a cold, a cold shower always opens up my nose and makes me feel better

No. You better avoid it. Try slow breathing, 5 seconds inhale and 5 seconds exhale through the nose to maximise o2 levels in the cells. No deep breath only light breathing in the belly.