Waking up at 1:00am with chills that last about an hour?

going to bed at 10:00pm …waking up at 1:00am with chills that last about an hour …try to go back to sleep but my mind races over and over about some random event. When I get up the next morning I have a headache and my whole body feels terribly achy …..painful to even walk around….ruins the whole day
This has been happening once or twice a week for about a month now…..doesn’t happen every night
and I only get the chills at night….the last time i thought I was going to vomit but didn’t …the feeling went away

Age:63
Male
Medications: None