I've had covid since April 2022 and still have problems with temperature regulation. Most of the time I'm too hot. It's December in Montreal and I'm still walking around outside in sandals, light jacket, and skirts! On the other hand my body can suddenly switch and I'm shivering in the house and putting on my sweater. My understanding is that it's due to disfunction of the autonomic nervous system. Mine is whacky in many ways.