Was running a temp like that for almost a year.....they never did determine what was causing it. It could have been any number of things. I had messed up my body so bad with OD's & not eating, & had so many horrible side effects from the meds I was prescribed & in & out of the psych & medical hospitals. Don't think my body really knew what it was supposed to be like or do.....but after that year, it went back to normal also.

Sometimes it's just our new normal.

Hope you find out something.....but don't be surprised if you don't.