Core temperature...

I am super paranoid about the whole "don't raise your core temperature" thing. My doctor said not to engage in activities that make me sweat, and to make sure my skin doesn't turn pink or red in the shower. I've been taking barely lukewarm showers, and I am so sick that engaging in any activity is a joke. But what about at night being wrapped up in the blankets and I start sweating? Or wrapping up in blankets on the couch with my dog? I don't know why, but I'm freaked out about it.