I am with the others. I would get a complete thyroid panel. TSH, T3 & T4 & Thyroid antiglobulins & antibodies. My Hashimotos (Hypothyroidism) did not show up in the normal thyroid panel It wasn't until I went to an Endocrinologist that did the complete panel mentioned above that my thyroid anitglobulins & antibodies were high. Also Raynauds Syndrome can make your hands and feet very cold as Thyroid Disease (depending on if you which one you have...hyper or hypo) can make you cold or hot. Praying for you and God bless you.

Ask him to check your iron too. My husband spent 18 days in the hospital with pneumonia. He lost a lot of weight and is always cold. It was his iron levels.

Here’s a fun term to ask about: dysautonomia. The autonomic nervous system runs our internal systems without us normally needing to think about them. Has your internal thermostat gone a bit haywire? I hope not, but you are describing repeated episodes of chills where you can’t get warm. Lots of suggestions in the chat here- and certainly some conditions for your provider to think about and rule out as causing your symptoms. I’ve recently been reading about autonomic dysfunction in autoimmune disease- and there’s some good evidence of it causing symptoms in long COVID- so it might be worth asking about.