Vicky,
Lupus and other ai diseases are systemic and screw around with our body thermostats. First I was too warm and then cold. If you have raynauds that does not help with the cold. Keep in mind that raynauds can affect far more than just your fingers and toes. If you are less active and more sedentary that is also a problem.
Lots of things can impact your body heat regulation.
Bill