anyone with thyroid issues - lack of sweat question

I have been finding that I can not sweat any more.  I tried to mow the lawn in very hot weather.  I found myself getting over heated and no sweat came out.  i used to sweat, but the last couple of years i can not.

I talked to my GI today and he does not think I am showing signs of dehydration.  The cholestyramine has completely dropped down my D.  i pinched my sking and it goes right back.

GI told me to discuss this with my GP and possibly get a thyroid test.  Anyone here with thyroid issues find a lack of sweat?

I have thyroid disease (once was overactive and is now underactive) and I still sweat, but I'm also being treated.  Used to sweat all of the time when it was overactive.  If it's underactive and not being treated, it could cause you to not sweat enough.