As was mentioned upthread–you may be anemic. Take a multi-vitamin and increase your activity level a bit.
I find I get colder and colder just sitting in front of the computer–my metabolic rate must be in negative numbers when waste time online! Intersperse sitting down with activity and I think you’ll find that you are warmer overall.
But it wouldn’t hurt to get your blood checked at the doctor’s–ask for a CBC with differential. I had my Hemoglobin checked for years and it was always fine–but I was freezing and couldn’t adjust to exercise (running–it never got easier) and I was always, always tired. Turns out in my MCV (mean corpuscular volume was 68–waaaaay low. That means I had itty bitty red blood cells-I had plenty of them, but they were teeny). Now I take iron and voila! I am warmer (stopped running, though–oh, well!).
I have good and bad news. When you get old (the bad news) and are peri-menopausal you will finally, finally, finally be warm (the good news). Unfortuantely (oops more bad news) sometimes you will be tooooooo warm.
I was always freezing until I hit 50 (wore socks to bed when it was 80F and still had cold feet). Now most of the time I am comfy. Sometimes majorly overheated (slightly more bad news), but taking a turn around the yard in the middle of the night sans clothing helps a lot (we live in the country, no exhibitionism).
And now my husband, who acted as my heater for 30+ years, snuggles up to me for warmth. He calls me his “Toaster Girl” (more good news).
A lurgy (especially the Dreaded Lurgy) is a non-specific, generally minor and thus non-lethal disease that still makes you feel like death-warmed-up (although in the OP’s case, you can exclude the warmed-up bit apparently).