Hydrotherapy

Dr. Schulze ,
I am a big practitioner of hydrotherapy as you are but just wanted to know if it is recommended during a severe cold or even flu. I'm not just talking about hot and cold showers. My health club has sauna, steam and a fifty degree cold plunge which I use regularly. What combination of these would you suggest, if at all, during a bad cold or flu. Thanks for all your help. P.S., The most hilarious thing I ever read was when you suggested a doctor who was unbelieving of cayenne's power shove an unpeeled habanero up his ass! I was on the floor...