I am using the term temperature regulation to mean that once my body temperature gets higher or lower my body temperature does not return to what is normal for my body which varies through out the day.
This time of year my body temperature drops and my body does not return to normal. It is tied into the amount of sun energy that I have. A similar temperature differential in the fall when I have more stored sun energy there is no issue.
I have found that if I am out in the sun this time of year and take a hot shower or bath then get under an electric blanket than my body returns to normal.
I also find that if it is not too cold I can walk and that brings my body temperature up. If it is too cold the walking just makes the effect more severe.
The effect of having my body temperature not returning to normal is not that I am uncomfortable from being cold rather I get a stuffy head for about three days.
I can take Advil and that helps but I try not take anything more than I have to.