With my thyroid disease - I still was freezing even in humid 80's... Its not the outside temp that is the issue - it is the basal (inside) body temp.
HAve you researched anything on basal body temps? - That would be really good reading for you.
"I had a thyroid test and the doc said everything was normal"
Ask for a copy of the lab report. Verbal is not sufficient.
Copy / post results with the RANGES used by the lab. Normal can be a 'gray' area.
"My doctor hasn't a clue" - that's why their paid so well. (hey, wait a minute!)