I’m in the same boat, OP. My labs are all normal, but since I lost a significant amount of weight, I’m always cold. Like long sleeve cardigans in July cold. I had a fever recently and was warm then, until the chills set in

My doctor said it’s not uncommon after huge weight losses for people to be cold, and it’s not necessarily indicative of a problem. It might get better or it might be my new normal. Time will tell.
I layer and keep those little microwaveable rice hand warmers in my pockets at home. I sleep with tons of blankets. Wool socks. Hats really help me feel warm. I’ve switched from candy in my stocking to warm accessories like gloves and warm socks at Christmas. My heated mattress pad is a lifesaver.
This has probably been going on for about 2 years.