Hello @loomis4j, Welcome to Mayo Clinic Connect. I would like to introduce you to other members who have also discussed Idiopathic Anhidrosis. I'm hoping @weasel70, @alexsimon, and @sidepockets will be able to share some suggestions or information. Mayo Clinic does have some information here:

Anhidrosis — https://www.mayoclinic.org/diseases-conditions/anhidrosis/symptoms-causes/syc-20369400

Has your doctor offered any treatment suggestions?

I have been to the Clinic twice for evaluation. I originally was diagnosed with no sweat over 97% of my body. I took high doses of prednisone for 6 months and i improved to 83% of my body had no sweat. I then went on a high dose for 3 months 500 mg of methylprednisolone infusions. Felt better for a year but now the shivering and heating up during the winter is pretty severe. Looking for help. PS I am 70 years old.