I saw an infection disease doctor at the beginning of my journey in 2022. Consistently temping 100.0 and over. Typically I was a cool gal, normally 97.7, when I was sick 99 was miserable. I was told it was due to Covid affecting the hypothalamus where temperature is controlled. Temperature dysregulation. I am cold body hands, my feet burning and red and my temp will be 99.7. Any kind of activity such as getting dressed in a hurry raises me to 100.4. When the weather is warm, my temperature stays higher all day, 100+. Very uncomfortable causing my anxiety and panic to increase, also which I never had before. I am sorry you are also going through this, but know, you are not alone.