Hi, I get this too and I think it's hormone-related...don't know if you're female, though!. If so, do they come on in the week or two before your period? I find that right after I ovulate (I'm 35), my temp goes up and stays up until I menstruate. Not EVERY month, but most months. Then, a day or two into my period, I feel better.
It's quite uncomfortable and annoying. Sometimes I'm even boiling in the middle of the night! Also, my hands and feet are cold/clammy.
I've read up on this and there is stuff about temperature fluctuations during the luteal phase of your cycle.
Also, I've had anxiety-rela
ted issues for about 15 years. Started noticing this around then as well. I think when we're constantly in stress mode our bodies heat up...fight or flight response and all that.
Does any of this help?