My legs arms and stomach are cold all the time?

I am 48 year old male on synthroid meds and my blood work is all normal but my legs arms feet and stomach are freezing cold all the time even in hot weather, I live in Houston it very much a hindrance in my life. My endocrinolagist does not know the answer I have been to 2 for many years . It seems to be getting worse any help would be great Oh and i have also been to a cardiolagist and every thing is normal what other cause could there be I am 5'9 185 in descent shape help